If you believe in the evolution of religion and that each new religion that is created relies on those before it for their fundamental truths, then it might be easier to accept that as the human mind expands its capabilities, new and viable religions will form to accommodate the most intelligent among us. If you can’t fathom that, then maybe this - as we learn more and more about our brains, some of the basic principles of major religions come into focus more clearly. The call to love unconditionally and forgive unconditionally particularly fits this mold.
As advances in psychology continue, we frequently learn that the things we find unforgivable in others may not be the end result of free will as much as they are a product of the warped chemistry within our own minds. When we take a moment to recognize that we cannot truly know what lies inside a person’s head, we give ourselves the opportunity to stop judging for a moment and forgive the faults, large and small, that we may find personally unforgivable. Depression, obsession, defiance, and deceit all could be the result of bad brain chemistry, and while we should not forget what people do to us lest we be burned a second time, we should at least try to forgive their transgressions, whether they ask for forgiveness or not. Unconditional love IS unconditional, after all.