 And then living that out, taking one step forward every day and fulfilling your role in the story that you think that God is telling. Some days your confidence will go way up and some days your confidence may drop significantly low. But as long as you have enough reasons to think that it's most likely true, then you can continue on being a believer in Jesus. If at some point you get to the place where you say, I'm pretty sure that this whole thing is just false.