There is a brief pdf excerpt that this post is based here.
The book debunks the common apologetic records for the historicity of Jesus.
Then it show the similarities between Jesus, Buddah, Horus, Mithra, Krishna, and Prometheus.
It then goes to show that early Christian apologists destroyed early records of the similarities between Christianity and other Pagan religions, while shooting themselves in the dick by writing things like "You say we worship the sun; so do you."
Next, it explains how the Jesus myth and other myths were based from the sun.
It says the book of Revelations is just a reiteration of the Egyptian book of Zoroastrian.
Then, and you probably already knew this, that the Saints were often based off of gods from other religions.
And the last part being that the 12 disciples where just the 12 signs of the Zodiac.
And a few things you probably already know, but add to my point;
Christmas and Easter were originally pagan holidays and the Flood story of Noah was just a reiteration of the Epic of Gilgamesh.
My point being, Christianity is a plagiarism of various Pagan cults, knowing this, how do you rationalize staying a Christian? (Because I know this isn't going to change anyone's mind.)