Its you that is confused. You don't know the words of Jesus either, you only know the translation of what some guys claim he said and did. As for the words of God - on the baseless assumption there is a god - all we have are more unrealiable writings of occasionally known authors claiming to speak on his behalf.
To make it clear to you. Jesus never wrote anything. God never wrote anything. So nobody knows their "words", but many people make that claim.
For the same reason Christians reject every other god, Atheists reject yours. Christians are 99.9% atheist, with one exception, Atheist just go the final distance and reject that final god you cling to.
BTW, I don't belief that JC is an atheist, if I recollect correctly he has some supernatural leanings toward a supreme being - just not your God. Correct me if I am wrong J.