Theists, are you immune to being decieved?

[Neo-Scholastic]

...if we were limited to the exact words in the definition, would you be willing to adopt this view...A belief that cannot be proven false couldn't possibly be a delusion....perhaps "delusion" is the wrong word. Your thoughts?

Many forum members use the term 'delusion' as a hyperbolic description of people they believe are deceiving themselves about something. Usually because the alternative is, to their mind, unthinkable. So, I would distinguish between delusion and self-deception. A person who is delusional cannot distinguish fantasy from reality. As such, that defect would play out in multiple areas of their life. On the other hand, a self-deceived person can distinguish fantasy from reality, but chooses to not do so.