The human brain evolved just like our limbs, our features, our other physical attributes, of which it is nothing more or less. As has been stated before, the concept of God - and the resulting inventing and organizing of "religions" - is a byproduct of this ongoing development, not the source of it. While it's hard to fathom very many good reasons to explain the positive uses of hard-wired "faith" - it is after all, inherently wasteful of our limited resources - it does seem that aggressive behaviours in early religious societies, the tendency to procreate among their own communities, the removal of fear of death and the applications of invented purpose to our fleeting lives made evolutionary impacts on our brains, as they developed (and continue to develop). Ergo, today we have rather dubious but numerous people feeling that their saviour of choice is with them at crucial points in their lives, unwilling or unable to acknowledge that is a process of the mysteries of their very brain at play, not personal proof of the presence of God. Anyway, that's just me.