Many atheists and agnostics attack Christianity on the basis that God is really evil. They assert this even though they don’t believe in God or the Bible. They don’t believe in objective morality either. Here is a super short video (2 minutes) from Dr. Frank Turek refuting this lie.
Atheism cannot account for an objective moral standard, they have no way to ground their morality. Materialism i.e. Ontological Reductionism cannot say why torturing babies for fun is wrong objectively. In this worldview, all they can say is that they don’t like it since it ends up being just the atheist opinion against the torturers opinion.