Two questions:

A: Why are atheists so hostile to Christianity?

B: Why do Christians feel the need to engage them with arguments?

I won't argue with atheists. Their brains are configured in a manner that doesn't allow their thoughts to extend past the tips of their noses,..and that's fine,..."eyes to see and ears to hear".

Some have it,....some don't. There's no reason to argue with those who have yet to realize that their consciousness, their experience of the world around them is being transmitted to them via their souls.

That glob of meat in their heads cannot produce consciousness no more than a MacBook Pro can process conscoiusness.

You've got a tool in your head that keeps the system functioning. But it's not consciousness.

Being self aware comes from a metaphysical source that's much more complicated than a piece of meat can provide.