Comparing Descartes 'Certainty And The Limits Of Doubt'

In Descartes', "Certainty and the Limits of Doubt," he analyzes the process and method whereby he comes to the clear and certain exclusion that he exists. Descartes begins with accepting that he has possessed truth and certainty through his sense, however he admits that sometimes the senses are deceptive. He then states that he must consider the fact that he is a man, and because of this he must sleep. Descartes proposes the idea that we are all asleep and all these particulars are false and illusory.
However, like painted images, there must be some truth behind the things depicted. We are then bound to admit that there are simpler things that are simpler, more universal and are real existents. This is why we conclude that disciplines of treating
composite things are of doubtful character in comparison to arithmetic that deals with simple and general things that are certain and indubitable. Descartes believes this is true because God being all good would not allow for humans to be deceived and believe 2+3 is 5 when it wouldn't be. But then he decides to view the argument from an atheists' perspective and he hasn't reply to this argument. So he decides to start listing off what is false. Descartes proposes that there is an exceedingly powerful malignant genius, instead of an all powerful and good God, that is cunning and has devoted its powers into deceiving him. Everything is false and his memories have never existed and he