Pascal was the first Christian apologist to accept publicly that
it may not be possible to prove that God exists. Instead, he
proposed what has become known as Pascal's Wager. This states that
it is better to live as if God does exist, because if you are wrong
you have lost nothing, but if you do not worship God and you are
wrong you have lost everything. There are flaws in Pascal's Wager,
not the least of which is that it would logically require us to
worship every god, not knowing which one might exist. However
Pascal's proposition was very influential for a time.