There can be no such thing as an “Atheist” who hates God. If there is a god to hate, one must necessarily be a “theist” to hate it.
On the other hand, I suppose an Atheist could hate “god claims” or possibly 'religions." If the atheist were a real bigot, he might hate all religious people.
Hating God is just not something an atheist is capable of doing, well… unless of course … some theist can manifest that God and thus provide a target to hate.