How do you believe in religion without proof?

I’m not traditionally religious I believe in after life but not exactly how others do I believe in it in the way that I don’t think all this energy and being can come from nothing and be nothing after we die but the idea of heaven I’m open to but have a hard time believing 100% please tell me how you see it. I’m also becoming more open to it in the last 48 hours I’ve lost my dog and I’m devastated

How do you believe in religion without proof?
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