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In Meditations on First Philosophy Meditations III and V Rene provides arguments for the existence of God.

Arguments for the Existence of god:

If he can conceive of some idea with so much objective reality that it must come from some cause with more formal reality than he possesses, the Meditator reasons that he will then know that something outside his mind exists.

God is an infinite substance whereas he is only a finite substance. Since the idea of God cannot have originated in himself, he concludes that God must be the cause of this idea and must therefore necessarily exist.

God: his existence would immediately be perceived clearly and distinctly if it weren't for the confusions caused by the senses and preconceived opinions. Now that God's existence has been established, it is as certain as any other clear and distinct perception.

Why does he offer these arguments?

He wishes to prove the existence of the external world in order to achieve his aim of a new system of knowledge built on solid foundations.

Do they work for his purpose?

Are these arguments sound?

he cannot doubt the existence of God, since he has such a clear and distinct perception of God's existence. The idea has infinite objective reality, and is therefore more likely to be true than any other idea. He concludes