What can replace God?? 180 Proof and Dimosthenes seem agreed that religious sources get misused for bad. Taking several steps back I note the etymology of "god" is in "to which or whom a libation is poured", "bhaga" or "bog" "to which or whom offering is made" (cognate with "beg" ask an offering, "bag" container to bring an offering, "big" generous enough for an offering), "dieu" and "diable" share a root meaning some big sort of spirit, "theos" is law giver.
To the old Greeks law giving was about the basis on which natural phenomena would settle down between periods of upset. Some extended that to mores but only in the sense that they saw themselves as part of the world. Their relationship with that god or with the gods plural, which were deliberately portrayed in fanciful terms so as to try (unsuccessfully) to not become intense, was metaphorical and not personal.
Epicurus warned most poignantly against superstition.
I wish a concept would catch on which (I seem to remember) actually existed in my young day, namely to be agnostic (usually calling oneself atheist) but look for reasons to base one's moral outlook on wholesome secular principles.
Aristotle's Nicomachean Ethics are mainly mental ideas for thinking. I don't think his attitude to "god" or "gods" was anywhere near as "moralistic" as has usually become commonplace since.
The merest mention of "god" seems to lead most people to this moralistic concept which doesn't warm, doesn't encourage, it just takes away from us. I sense a lot of people are getting "triggered". Using the three stages of perception Husserl identified occurring BEFORE we reach the judgment phase, we could fortify ourselves in the face of the "meme" aimed at our habitus, by revaluing as Nietzsche calls for.
Nietzsche who lived in the run up to Kaiser Bill times poignantly shows us a man with a lantern looking for "god" in daylight saying "we have killed him you and I" meaning the oppressing bourgeoisie. A "superman" or "overman" (English prepositions don't get it right) is someone that has to rise out of oppressing precisely by becoming their own free self. (The overgrowth in fundamentalism was a later counter-misreaction to the scene around Kaiser Bill whose supporters had emphasized how Christian they were.) I sense there is a lot of quasi-indexicality in Nietzsche - speaking in the voice of his characters, often without speech marks (some commentators hold Hume and Plato are doing this too).
Respect the other (e.g family members or employees) enough to leave them free as ends to themselves, and not your means to use only; don't go as far as despoiling the jungle or plain that helps you eat or the earth that helps you build.
What and who is, calls me to respect it / them: my own original version of is = ought. Apparently Hume was an ironist. Hume was probably only saying we won't catch many people inferring (to any partial degree) from is to ought because that's how people around him were, and wasn't laying down a categorical entailment in the opposite direction.
Virtues = going equipped.
Morals are to do with morale (Julian Baggini says).
When we de-intensify both morals and the optional extra religion, the latter might simply be a non-heavy going personal relationship, singly whether sometimes in the company of fellows or not. A god worth its salt doesn't need "defending" in the way usually thought. I have lots of affinity with honest atheistic agnostics. That my own discovered "redefining" of "god" differs from all those I meet reassures me (and amuses them). Thus, any existence or absence of mere religion around individuals left to choose (rather than pressured by agitators), ought to become a non-issue.