Ex-Buddhists who left religion altogether—how do you deal with people enforcing beliefs on you?

I grew up in a Buddhist environment, but around 14 or 15, I started questioning it. At first, I was deeply interested—I read books, listened to Dharma talks, and explored Buddhist philosophy. But as I expanded my reading to Daoism, Nietzsche, Machiavelli, and Emerson’s Self-Reliance, I realized Buddhism isn’t uniquely profound. Like any other religion, it has its own dogmas, and the ruling class pushing it for control made sense to me. But beyond that, I struggled to find validity in its core claims.

Buddhism heavily relies on the existence of karma and rebirth, but there’s no actual proof—just the claim that Buddha said so and that enlightened people can supposedly "see" it. If you don’t believe, it’s just bad karma (pau). On top of that, I see a lot of people pushing ideas like adi mānasika bala (higher mental power) and other unproven supernatural claims.

One thing that really frustrates me is how these same people often dismiss science or twist it to fit their beliefs. Lately, there’s been this trend of "quantum physics proves Buddhism is true," but the people saying this usually have no real understanding of logic, math, or physics. They talk as if they could teach quantum mechanics at a PhD level, but their arguments are completely nonsensical.

For those who left Buddhism (or religion in general), how do you deal with these situations? Especially when people try to push these beliefs onto you? I try to avoid these conversations, but sometimes I get cornered—like when a relative tries to rope me into something. If I say I don’t believe, they start droning on, and I end up arguing back. How do you handle these interactions without losing your mind?