I had very connected-universe and even very spiritual experience (as an +-agnostic) when on shrooms, consistently every time since I took my time with setting and mood (and was alone).
It didn't bring me a nanometer closer to believe in religions, in contrary - when you know some tweaks to brain chemistry and receptors can produce this, religions are very close, just another tiny step, and eventually somebody charismatic will pick it up and succeed.
It did bring me much more respect for my brain and deeper insights into my personality than I could ever gain even doing ie very intense dangerous sports (which definitely do make you know yourself much more, and even redefine personality a bit).
It didn't bring me a nanometer closer to believe in religions, in contrary - when you know some tweaks to brain chemistry and receptors can produce this, religions are very close, just another tiny step, and eventually somebody charismatic will pick it up and succeed.
It did bring me much more respect for my brain and deeper insights into my personality than I could ever gain even doing ie very intense dangerous sports (which definitely do make you know yourself much more, and even redefine personality a bit).