Hi, my name is Matt and this is a good topic!
A while back I turned myself into an atheist, or at least tried to, in order to understand atheist better. For the most part, the atheist I conversed with on a regular basis had a history of negative association with religion....former jehovahs witnesses. Like myself, I didn't want to believe in God because he caused me much pain growing up.
But then I came across Christopher Hitchens and Richard Dawkins and there seems to be a new atheist movement arising from these two antichrist atheist that I'm labeling radical atheist. They have a major chip on their shoulder because they think belief in God is not healthy, dangerous really, a burden on society and hypocritical.
They look at how Yaweh in the OT used war and some not so good people to accomplish his will of ensuring Jesus's lineage wasn't destroyed, so they call him an angry abusive power hungry genocidal tyrant, and they don't like anyone who worships him.....so they have labeled that which say's does not exist.
The other atheist is the scientific atheist. Existence can be proven by the science of man. While science has opened up further questions like the age of the earth, similarities between species, etc. they have yet to even contemplate where that little tiny molecule came from that caused everything in the cosmos to come to order.
Then you have the conspiracy atheist.....Jesus was just a myth like Mithra, Osirus, etc. They like to point to many different parallels with other godmen so they feel justified in saying if Jesus was just a myth, then Jehovah as well is just fancy storytelling by ancient shaman. I just ask them then where are all the followers of all these other myths? It seems for the most part they have died out and barely existent, Jesus has been around for 6k years and it doesn't look like he's going to fading into the history pages any time soon.
Matt