Well, sure, but it’s not like there is no basis for differing. I bet my life on my eyes everytime I cross the street. But we are all pragmatists, and we will accept the most basic things on faith (except, I suppose, for brief moments of absurdity, and those like Descartes, who fell into insanity when he realized he could not prove that his hands were his own).
However, there remains a thread of positivism in almost everyone’s mind; we try to accept as little on faith as possible, and some people just do not feel comfortable accepting religion. This may stem from an inadequate understanding of what religion is, and what reason it entails.
Particularly unnerving, to the sane individual, is the tendency to the supernatural that religion seems to allow; religion is not supposed to be supernatural. God is not supernatural; on the contrary, God is supposedly the most natural thing there is. There is no magic; God does not violate the natural laws which He set forth, and this idea has been unacceptably lost or tainted by superstition and poor education.
“Whatever a man prays for, he prays for a miracle. Every prayer reduces itself to this: Great God, grant that twice two be not four.”