A first step is to actually allow yourself to question something and then go and seek the real honest answer not the pat, glib, manipulated spin you normally swallow, ..., the next step to exiting the cult is to allow yourself to question everything.
Once you have given yourself permission to question it all then the cult has lost it's magical grip and escape becomes possible, then it becomes probable.
For me, it took a douchbag scam artist pedalling quack medicine to be made an elder despite all the noises coming from the elders that this would not happen for me to go and make the actual effort to make sure the religion of my birth was in fact true or not. That gut wrenching disappointment and anger in that pillock being made an elder put my brain in a state where i allowed myself to question, at first the basics and eventually all of it.
I'd had doubts as all do, but the internal suppression of them is strong and it seems to take an external kick to put the mind in a position to allow it to change it's way of thinking.