For people who've read the Da'Vinci Code?

I'm just now reading the Da'Vinci Code, ( know it's late, but whatever) but yeah, it's a really good book, but some of the points on 'religion' in this book are quite realistic. Are they true? I know there was some type of controversy around the topic of the book, but I never got the details on it. Some of these things I looked up, like the original painting of 'The Last Supper', where it shows that there are actually 13 cups, and a WOMAN sitting next to Jesus, who is 'supposedly' Mary Magdelene. You know the woman who is portrayed as a prostitute in the bible? I'm NOT a Christian, and I really don't agree with most of the beliefs in the Christian religion...and this book just makes it seem like all of it is lies. If it's true, I would feel so much more comfortable with the religion. But I don't know if it is...so is it? Again, this is only for people who have actually READ the book, not some Christian activists trying to preach hate to me. Thank you.