However, the law of gravity cannot be "proved" as such, but that does not make it reasonable to jump from a tower expecting to fly.

If I were to place a bet on the Pascal wager I think I will choose to believe. If you place your bet in the existence of God and determine to seek him, you lose nothing, even if it turns out that God does not exist and there is no life after death after all. But if you bet against God and abandon searching for him, and he does exist and rewards those who seek him, you lose everything.