God is Santa Claus for adults

[Thoughtseize]

It's not blind. Essentially everyone has some sort of presupposition and that ultimate presupposition leads to circular reasoning.

For example you presuppose reason you have to use reason to prove your case. And the Christian presupposes the Bible and has to then use the Bible to prove his/her case.

This however doesn't mean you can't look at other evidence to investigate the claims. You can have wider or narrower circles. You can use other information to supplement each sides circular reasoning to compare one to another.

So it's not as if you're left without ground to examine each others beliefs. Even Christians have to admit they need more than "just the Bible." Apart from ideas outside of the Bible they wouldn't even be able to read or understand it.