I was driving through farm land in New Jersey. I noticed a surprising number of bill boards for jesus and god. It gave me a notion as to why so many people unquestioningly accept the existence of god.
God seems to be everywhere... in the churces and other places of worship, home-made signs on people's lawns, bill boards, everyday language, holidays, TV, movies... it goes on and on. He's as ubiquitous as air. We can't see air, but everyone agrees it's there. Well, one might reason that god is much like air in that respect. Everyone seems to agree it's there (except cranks and contrarians).
As a former theist, it was very easy for me to lapse into that mode of thought as I drove past one reminder after another of god and his son. In that altered state, I heard the voices of my fellow believers sarcastically say 'Sure...There's no god...EVERYONE's wrong'. I could feel the plausibility of god's existence.
I would imagine most people feel the same way, and so being atheist... believing the opposite of what seems to be the consensus of the entire world since adam and eve, would seem rather stupid.
Remember: This is NJ, not Dixie or Indiana or Idaho. Many many places outside of cities in the US must be like this.