How to start a new sect/new religion for dummies.

[Cyberman]

And yet every theist insists theirs is the only true religion. How can anyone know one from the other, or that there even is a true religion (let alone that there must be one)?

This is a good question. A real key one. One that not enough Theists ask themselves. I can assure you I have thought and reflected on this issue. I also believe I have clear proofs regarding my creed. 

The problem is over here if I begin to prove why my specific creed is best, people will just say, you haven't proven God yet. I can answer this question, but the thread cannot be all be replied to by "prove God or we don't care what you can prove with assuming God exists as a given premise".

Then you need better evidence. Evidence that better stands up to basic scrutiny and matches reality.

Atheists are claiming they are not blameworthy or at fault for not believing in God

That's not a claim; that's basic burden of proof.

and knowing he exists.

I don't know "he" exists. Neither do you. How can I say that? Because you would be able to demonstrate that knowledge without resorting to logical and linguistic acrobatics and red herring tantrums.

Most Theists don't buy that. They believe you ought to know.

Not my problem.

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Incidentally, what's with all the weird font size tags polluting my words? I had to edit all that shit out.