Another area of common ground governing our understanding about religion is that we share the expectation that all our beliefs are true. No one in their right mind or stable psyche would purposefully hold a false belief. Whether or not our beliefs are in fact true, we think they’re true; otherwise we would not hold them. If I held a belief that was false, I would want to know it. The nonbeliever may not be willing to admit this, but they intuitively embrace the idea that their beliefs are true. This shared expectation is important capital we must cash in when encountering nonbelievers.
From my essay “Why Apologetics is Important to Your Church”.