as one having recently been in the theist camp for many, many years, I can say i used to believe/say nothing would ever ever make me change my mind or convnnce me god wasn't the everything I needed.
What i know now is I held that belief only because I had never looked outside my narrowly constructed box of religious thought and curiosity. Testing the scriptures meant reading more of them, more commentaries, and more apologetics or criticisms of "false" religions. It was a giant circle jerk. Any doubts I had were either dismissed or covered over with "thats just gods way" nonsense.
Now... to move me back, I would have to see direct, unambiguous proof of a deity intervening - maybe showing up for all to see and doing something impossible. Would that cause me to worship that thing? No, why would it?