This is not meant as an attack on Descartes, his intelligence, or his philosophy, but I find it difficult to believe what he says based on the time period in which he comes from. He is no doubt a brilliant philosopher and much better at philosophy than I will ever be. Besides his expertise in philosophy, he was a brilliant mathematician. I also do not understand all that he says. His discussion of God, in particular, I find very interesting.
I believe there was an important passage which caused me to soften toward Descartes: “It is no objection that I do not comprehend the infinite or that there are countless other things in God that I can in now way either comprehend or perhaps even touch with my thought.” It is when a scholar or philosopher admits something like this, and really means it, that I warm up to them. This does not guarantee a belief in their philosophies or points, but it provides me with a glimpse into their character which I can appreciate. The same thing happened with Socrates; he claimed to know nothing. And although Socrates could be self important, he never claimed to know everything; on the contrary, he claimed to know nothing. Whether this was an act or he really thought he knew everything, it made him more palatable.
Having been raised Catholic, having been confirmed, having been a confirmation sponsor twice, and having attended twelve years of Catholic school, I was taught to believe that without a doubt God “necessarily” exists. There is a God. God created mankind. Read the Bible. Go to Church. When Descartes writes about the possibility of God, his conclusions, through his reasoning, always comes back to the answer that there is a God and he created mankind. I do not necessarily believe this conclusion, although I could not provide anyone with an alternative answer. Reading Descartes caused me to look at the perpetual question “is there really a God”.
This could make philosophy dealing with theological issues (God, Heaven, souls, the afterlife, etc.) a dangerous study during times of strict religious influence. When Descartes examines the idea of an infinite being he could have been delving into a very sensitive area, especially if he decided that God did not exist, that there was some other infinite being who was not God, or that an infinite being by the name of God or any other name did not exist. Having knowledge of the strictness and the influence of the Catholic Church on history would cause me to wonder how much trouble the Church gave the philosophers. If art had to have a proper religious focus and certain books were banned, how did the philosophers fare in the time of the Inquisition and other oppressive periods of the Church? The slightest slip up or word the disagreed with catechism or doctrine could get one in a lot of trouble.
Notice, once again, my interest and focus in history comes out in my observations of philosophy.