While religion would be cool in Stellaris, the problem (which some people have already mentioned) is coming up with religions for aliens. Humans on one hand could simply use real world religions; Christianity, Islam, Buddhism, etc. However, it would be harder to come up with religions for aliens; you could either come up with set religions for aliens (while not bad, not very diverse either), or have randomly generated religions (which would probably be too time consuming to code and would probably not even play well tbh).
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