How do you control/stop the lingering “What if they were right?”

I feel stupid for even having this problem but especially in times like these, where all of my family is preparing for Armageddon, I can’t help but have this anxiety in my chest. What if they are right? What if it’s the truth? I don’t believe it is the organization is a horrible thing and the ideas seem ridiculous to me now but there’s a constant what if that I can’t shake. It gives me so much anxiety. I almost wonder if it’s just fear engrained in me from being raised in “the truth” but I’m really hoping it’s something I can get rid of because I feel like it’s holding me back. Has anyone else experienced this after leaving?