If you believe in God and He exists, then you win everything; if He doesn't and you're wrong, you lose nothing. So why not believe in God?

Physics-Man
If you don't believe in Him, and He exists, you lose everything; if He doesn't and you're right, you lose nothing but don't win anything either.

This is Pascal's Wager. It isn't proof for the existence of God, but it can help in the search for God in the absence of any proof. As originally proposed by Pascal, the Wager assumes that logical reasoning by itself cannot decide for or against the existence of God; there seem to be good reasons on both sides. Now since reason cannot decide for sure, and since the question is of such importance that we must decide somehow, then we must "wager" if we cannot prove. And so we are asked: Where are you going to place your bet? If you place it with God, you lose nothing, even if it turns out that God does not exist. But if you place it against God, and you are wrong and God does exist, you lose everything: God, eternity, heaven, infinite gain. "Let us assess the two cases: if you win, you win everything, if you lose, you lose nothing."
Consider this diagram
Consider this diagram
The vertical lines represent correct beliefs, the diagonals represent incorrect beliefs. Let us compare the diagonals. Suppose God does not exist and I believe in him. In that case, what awaits me after death is not eternal life but, most likely, eternal nonexistence. But now take the other diagonal: God, my Creator and the source of all good, does exist; but I do not believe in him. He offers me his love and his life, and I reject it. There are answers to my greatest questions, there is fulfillment of my deepest desires; but I decide to spurn it all. In that case, I lose (or at least seriously risk losing) everything.

The Wager can seem offensively venal and purely selfish. But it can be reformulated to appeal to a higher moral motive: If there is a God of infinite goodness, and he justly deserves my allegiance and faith, I risk doing the greatest injustice by not acknowledging him.
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The Wager cannot—or should not—coerce belief. But it can be an incentive for us to search for God, to study and restudy the arguments that seek to show that there is Something—or Someone—who is the ultimate explanation of the universe and of my life. It could at lease motivate "The Prayer of the Skeptic": "God, I don't know whether you exist or not, but if you do, please show me who you are."
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Pascal says that there are three kinds of people: those who have sought God and found him, those who are seeking and have not yet found, and those who neither seek nor find. The first are reasonable and happy, the second are reasonable and unhappy, the third are both unreasonable and unhappy. If the Wager stimulates us at least to seek, then it will at least stimulate us to be reasonable. And if the promise Jesus makes is true, all who seek will find (Mt 7:7-8), and thus will be happy.
If you believe in God and He exists, then you win everything; if He doesn't and you're wrong, you lose nothing. So why not believe in God?
10 Opinion