Perhaps because Christians so often misrepresent what it means to believe in God, atheists sometimes do not realize they profess Christian faith.
The evidence that I believe in Jesus Christ lies in how I treat others, not in what I do not do. A man may refuse to steal, murder or commit adultery yet think there are other men beneath him in intrinsic worth. A Christian believes all men (biblical language), male or female are equal before God in intrinsic worth, as such deserving of being treated with dignity and equity. We can come up with morality outside of God merely because we seek order within context of organized society. I am confident however that only a Creator could have come up with “Do not commit adultery.” Without “do not commit adultery” there is no relationship component to life on earth because all interactions, as is the case with most animals, are transactional in nature.
Regardless, without a Creator, there is no spiritual or moral argument for equality in terms of intrinsic value or worth of every life.
Faith that has any value demonstrates itself in its actions, meaning prayer or faith without corresponding actions is a useless activity. I have a post on this you can check out.
When Christians berate atheists rather than engage in discussions, they are wrong. Same applies to atheists. Some of the most intelligent persons that have lived on this earth have been Christians or atheists. We cannot then consign either stand to dustbin of lack of intelligence.
But do we want to remain Christians or atheists, or do we want to acquire knowledge and faith — both of which we cannot do without because atheism is not fact it is faith — for maximizing quality of our life here on earth?