If someone could "scientifically" prove creation or the existence of God, then believing in them would no longer require faith.
How would that be a problem?
Church would get real crowded.
Which church? Simply proving a God or even creation doesn't change too much, many people already beleive in at least some sort of higher power. People tend to assume that proving a God means proving their particular version of God, which it doesn't do. So, I see no good reason why God would try to hide evidence of his existence, as it really wouldn't change anything. Atheism and agnosticism are simply 2 more beliefs in a field of thousands, so even proving a God exists only improves your chances of figuring out the right religion by a very small margin, assuming one of the religions out there actually has it right.
