why bother? if they need an explanation, they aren't necessarily capable of understanding one. (that's not true of all topics or all explanations, but to even posit the question "how can you have morals without religion?" you have to have a belief system that would balk at an honest answer!
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Fear is not a good motive for ethics. "Because God says so" is not a good reason for doing anything. I never understood ethics until I ditched the God myth, and had to build new foundations for understanding right from wrong. I studied and built up my understanding of ethics based on happiness rather than fear. Now I am more happy and ethical than I ever was as a theist.
I honestly have no idea. I was raised without religion but have been told by countless people that I'm one of the kindest humans they know. Yet these same people claim that you need religion to have morals... I think this battle is one that will never be won haha and can just be left alone and shrugged off.
Been asked a few times....others have given better explainations....people need only their own rational ability to reason to have ethics and morals.