Everyone is promoting something, and men like Hitchens, Dawkins, et. are increasingly strongly promoting - their views, or ideology much as those in formal religion, and State-sanctioned secularism effectually promotes atheism and ever morphing morality, in rejection of the “old paths.
I dont believe in any religion or any scripture and I never discuss it with anyone. You might be drawing general conclusions about non-believers based on a relatively small sample who feel the need to burden others with their beliefs. The model can be seen among believers too.