TK, I agree with you. It is my understanding we are never required to love God other than with agape love which is an act of the will and not based, at least initially, on feelings.i can love God because i truly love Him, or because He commands that I love Him. Ideally, i will do it for both reasons. i may be on shaky ground(if I am, I know that I will be taken to task by others here) but it seems that either way satisfies the requirement, i.e. that I love God.
Athiest, if there is no God, and, as Sagan claimed, the cosmos is all there is and we are but an accident, then love of others, other than as far as it might benefit you, is irrational. Only total selfishness makes sense. Paul recognized this. "If the the dead are not raised, let us eat and drink, for tomorrow we die".
An athiest worked for me for a considerable time. He was the most rational unbeliever I ever knew: he was probably the most selfish person I ever knew. I actually liked him; he had a sense of humor and you always knew where he was coming from. No pretending to be anything other than what he was.
You seem to believe we were "wired" to be altruistic. I think someone did it, you say it happened by chance.
If life began by chance and evolution has brought us to our present state, then how can we say Hitler was wrong? He was only trying to help the process along, after all. Well intentioned man. Can't say he was immoral, that would only be an opinion, and irrational at that.
What say you?