 Anticant's principle can easily be fixed up by saying any ontological belief requires evidential justification.  Oh, well that's easy then. I have lots of evidence. For example, I believe (without evidence) that 'if the world exists it was created by God', this combined with some things that I have learned using my senses leads me to the conclusion that God exists.  We're interested in how you justify your beliefs, how you yourself come to believe they're not just choices but rather that you've found the truth. 