This is not true. Faith is certainty. The only "reasonable" position is agnosticism. "I don't know."
Nonsense. It is perfectly reasonable to say that something doesn't exist if there is no evidence of its existence. There is exactly as much evidence of the existence of the monotheistic Judeo-Christian God as there is of fairies, goblins, unicorns, gryphons, perpetual-motion machines, and every other bit of crack-brained wishful thinking people have ever come up with. Saying you know the latter five don't exist but don't know if the first does is merely bowing to social convention.