God exists.

God is Love. So there is the creation, because Love entails lovers. Creation is the lover. The meaning of life is Love.

The creation is infinite mercy. Mercy is always delivered by a merciful agent. So there must be God, because God is the infinitely Merciful. The Quran urges us to contemplate creation as the proof of God. The many small signs are proofs. But extend your contemplation to the whole of creation. Another name for the Cosmos is Beloved Mercy. And so there must be a Merciful Lover.