The person in the video is an atheist. He's making fun of Christianity.
I don't think he is an atheist. I think he is warring against atheism.
He is, try to watch the rest and you'll see the irony in it.
In fact, I think the statement "war on atheism" in itself is a parody of what some christians call "war on christianity".
These are not physical wars, but discussions/arguments.
Look from about 1:40 for example: "All well-knowing that they're [muslims are] doing the same exact thing [as christians]... Pff... Muslims are so deluded."
Also, look at the irony at 2:32+. "And of course, we have to pick what type of christianity is real - like mine, and what types are fake - like all the others."
This should make it even more clear:
At 3:13+, he says: "Finally, we christians even have the dabbeling science, like being able to spell... The... Second law of thermodynamics."
The second law of thermodynamics is an argument that is apparently often used by some christians against evolution, because it says complexity increase is impossible. They just forget to mention that it only applies to closed systems, and that we receive energy from the Sun, so we are not a closed system. He says it in such an ironic and pathetic way that he could impossibly be a christian.