If you want me to believe them as you do... then you have no choice in the matter, really. Either produce the evidence, or move on, understanding that you cannot win me over.
If you aren't trying to convince me of the truth of your claims? Then you probably didn't start talking to me about in the first place. So why would I care? How would I even know what someone's beliefs were if they never tried to tell me about them? You can be darn sure I DIDN'T ASK! And that because I do not care. The only time I care is when someone goes about the business of claiming they are right, or making statements that indicate they believe themselves to be correct that also, by the nature of them, implicate me in being incorrect. Then I am going to pipe up... and ask that the demonstrate how they have come to know these things they are talking about.
Again... if they never talked about it... I wouldn't know anything at all about it... and would therefore have absolutely nothing to challenge. Religious types have a very, very hard time not talking about it, however, and an even harder time talking about it in such a way so as not to convey the blatant assumption they hold that their knowledge is "the truth."