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I don’t know if it is the one truth but they make it feel like it is so.

Everyone I know feels this way. Not Buddhism for everyone, but about whatever truth they prefer to focus on. Doubt is part of belief. And if you take a strictly scientific view of the world, then you know that you can’t prove existence at all. Some people never think about it and function just fine. Others consider it for a bit, then realize they have to accept the limitations of knowledge and get on with life. To me, that’s what Buddhism tells us. If says you are suffering because you are worried that you should be doing something to make your life better, but actually, that best life is available to you at every moment.