We know that. The confusion seems to be with people assuming it actually has anything to do with theology. It just means "I don't like you.".
You seem to be the only one confused! When you said "I know that"...you evidently didn't!
Atheists are adamant in their rejection of God, or even the mention of His Name. Many atheists are even foolish enough to think they have all the knowledge to be possessed. But, to use the broadest brush, most atheists just don't like Christian people... and God is the reason!
To an atheist, it is science that holds the answers. But, to those of us with faith in a Living God, we know Who holds the keys!
I will pray that your hostility towards God will not keep you separated from Him. The results could really be hell...