The comedian Emo Philips has a well-known joke about religion that may explain some of the decline in membership... "Once I saw this guy on a bridge about to jump. I said, "Don't do it!" He said, "Nobody loves me." I said, "God loves you. Do you believe in God?" He said, "Yes." I said, "Are you a Christian or a Jew?" He said, "A Christian." I said, "Me, too! Protestant or Catholic?" He said, "Protestant." I said, "Me…
And yet our society is more polarized than ever. From your anecdote, one would think that declining religion would result in peace and love overflowing in society, but we see the opposite. Public morality cannot be maintained without religion; we will sadly see the end result of that in coming years.
Do you have evidence or arguments for this, or is this just a feeling? I can see an argument for the statement "religion can be and has been used to maintain public morality" but that's not what you said, so I'm curious about your reasoning.