At some point you have to make peace with open questions you don’t have the answers to. That’s not being irrational, it’s just accepting that our rational brains are very limited.

I’d encourage you to try the experience for yourself. I may not be able to convince you that these visions are anything more than “scrambling of neurons” with my testimony. If you are intellectually curious enough and open to trying DMT/ayahuasca, then it can only give you more data to base your worldview on. Worth a shot imo.