When is a Religious Belief Delusional?

[brewer]

Nope, I'm saying they are both. The same as people who believe in aliens, ghosts or witch craft. They don't necessarily meet the clinical definition either yet are wrong and delusional. 

That doesn't really answer the question.  They can be both and both are the same, or they can be both and yet being delusional entails something more than simply being wrong.  If it's the latter, then what is that something more that makes a person delusional?  If not, why use a term that is perceived as insulting when there is a non-insulting synonym?

It answers the question for me. What synonym do you suggest that I use? You can be wrong without a belief, delusion includes the belief.

[Angrboda]

That doesn't really answer the question.  They can be both and both are the same, or they can be both and yet being delusional entails something more than simply being wrong.  If it's the latter, then what is that something more that makes a person delusional?  If not, why use a term that is perceived as insulting when there is a non-insulting synonym?

It answers the question for me. What synonym do you suggest that I use? You can be wrong without a belief, delusion includes the belief.

The definition of a belief is an acceptance of something as true or that something exists. How can you be wrong without holding something as true?

Synonyms are: wrong, mistaken, in error, incorrect. But that doesn't answer the question either. You're free to do what you like, I'm questioning whether you have good reason to use the term delusion. Everything you're saying, in addition to your cheek, suggests to me the answer to that question is no.

[brewer]

It answers the question for me. What synonym do you suggest that I use? You can be wrong without a belief, delusion includes the belief.

The definition of a belief is an acceptance of something as true or that something exists.  How can you be wrong without holding something as true?

Synonyms are: wrong, mistaken, in error, incorrect.

I was lost and made a wrong turn. I didn't know that so I was mistaken. Not covering my sneeze was incorrect. I made an error in counting. 

None of these need a belief, or at least the same kind of belief as religion/theism. I doubt that you can substitute delusion in the above statements.

[Angrboda]

The definition of a belief is an acceptance of something as true or that something exists.  How can you be wrong without holding something as true?

Synonyms are: wrong, mistaken, in error, incorrect.

I was lost and made a wrong turn.

First of all, this is not about a person being wrong, but a turn being wrong. A turn is a thing. Things simply can't hold beliefs and the discussion wasn't about things but persons, so this example is irrelevant to the conversation. We're interested in the difference between a person being wrong and a person being deluded. Second, you've equivocated here. The sense of wrong under consideration is that which is the same as mistaken. You wouldn't say he took the mistaken turn, so obviously you're appealing to a different meaning of wrong than that under discussion. So this is not an example of a person being wrong rather than deluded.

I didn't know that so I was mistaken.

In order to be mistaken one has to be mistaken about something. If a person doesn't have a belief about something and one is just ignorant, then it is not appropriate to say they were mistaken. The only way not knowing could be relevant here is if they didn't know something relevant to a belief they had. Otherwise they are not mistaken because there is nothing they were mistaken about.

Not covering my sneeze was incorrect.

Not covering one's sneeze is an action. It's a thing. So the person isn't mistaken for not covering their sneeze unless they had an opinion or belief about the appropriate behavior. The action of not covering one's sneeze being defective in some sense is again irrelevant to the discussion of persons being wrong or mistaken, in the same way as your first example.

I made an error in counting. 

How does one count without beliefs about the number of things one has counted? Unless counting is something you can do without having any beliefs, it's not an example of a person being wrong without beliefs. Unless you're talking about, say, a person using a clicker to count off inventory. In that case, again we're dealing with actions rather than persons being defective. So it wouldn't be relevant. (And you're probably equivocating here as well, as making an error is an action and actions are incorrect in the sense of being defective, not in the sense of being mistaken. Actions cannot be mistaken because actions don't think.)

None of these need a belief, or at least the same kind of belief as religion/theism.  I doubt that you can substitute delusion in the above statements.

Half of your examples do in fact need a belief, and, in the sense you are using it, deluded most certainly could be substituted for the relevant expression of wrongness. In the other half of your examples, the thing that is wrong is not a person, so it's not a relevant example.

I don't know that you can't give an example of a person being mistaken without holding a belief, but so far you have not done so.

As far as we can tell from the examples you've provided so far, your distinction that delusion involves a belief where being mistaken does not appears to be incorrect.

[robvalue]

How far beliefs deviate from reality has to be important, I expect. Also, the reason for being wrong.

If I believe my car keys are on the hook as usual, but actually I put them on the table, I hold an incorrect belief. But this is a simple slip of memory, which will be rectified as soon as the mistake clashes with reality. If I continued to believe it was on the hook even after seeing that it wasn't, then I'd be deluded.

If my keys are on the table because someone else moved them since I put them on the hook, then I have an incorrect belief, but it's just a matter of not having up-to-date knowledge. It would again get corrected.

If I believe my keys are always in my pocket in spirit, and I can use that spirit to lock and unlock the door even without the physical keys, then I'm mistaken and deluded. This would cause a clash with reality as my belief would get challenged any time I didn't have my keys; unless I only ever "used" my spirit key and so didn't ever actually lock or unlock it.

[Neo-Scholastic]

Is belief in the existential equality of all human beings delusional? No natural facts support that belief.

[Mystic]

What is delusional is to rely on the judgment of God constantly there to give measurement and value to all things while at the same time using all that and denying him.

What is extremely delusional is to claim you represent exactly what God would be, and using that to deny his existence with the design of this world.

We are to recognize and not choose his beautiful names, but come to each of them, the guides, the leaders, in submission and in peace and not at war with them to hold on to a delusional ego that will surely perish and not last.

[Anomalocaris]

Is belief in the existential equality of all human beings delusional? No natural facts support that belief.

Yes. I am worth infinitely more than a quadrillion of you.

[Amarok]

Is belief in Is belief in the existential equality of all human beings delusional? No natural facts support that belief.the existential equality of all human beings delusional? No natural facts support that belief.

Aside the natural fact that your statement is wrong and founded on your delusional apologetics.

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What is delusional is to rely on the judgment of God constantly there to give measurement and value to all things while at the same time using all that and denying him.

Too bad we don't use your god to measure anything other then how absurd you are .

What is extremely delusional is to claim you represent exactly what God would be, and using that to deny his existence with the design of this world.

Too bad no ones doing that 

We are to recognize and not choose his beautiful names, but come to each of them, the guides, the leaders, in submission and in peace and not at war with them to hold on to a delusional ego that will surely perish and not last.

And this is crazed mystic babble.

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Is belief in the existential equality of all human beings delusional? No natural facts support that belief.

Yes.   I am worth infinitely more than a quadrillion of you.

And even that's a lower estimate

[Mystic]

What is extremely delusional is to claim you represent exactly what God would be, and using that to deny his existence with the design of this world.

Too bad no ones doing that 

I can make a thread filling it with examples of Atheists doing exactly this on these forums and it would be pages and pages of examples.