Can you determine whose beliefs are right, and whose are wrong?

You can’t say, “All claims about religions are historically conditioned except the one I am making right now.” If you insist that no one can determine which beliefs are right and wrong, why should we believe what you are saying? The reality is that we all make truth-claims of some sort and it is very hard to weigh them responsibly, but we have no alternative but to try to do so.

The Reason for God, Keller, Timothy (2008-02-14).(p. 9). Penguin Publishing Group. Kindle Edition.