Descartes Existence of God Rene Descartes lived from 1596-1650; he was a rationalist who wrote a book named, Meditations on First Philosophy. Descartes challenges the idea of certainty. Descartes presents the idea of an Evil Genius. The Evil Genius is a being that implants what we ... up by there being a certainty of God. He was able to establish that there was a certainty of God by laying a foundation to build on which was an idea. He first said an idea must have a cause, next he said that the cause must be as real as the effect of the cause. Through this ... and is convincing that there is...

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