Dr. Lowman writes:
It's only slowly that we're seeing the longterm results of our culture's move away from a Christian worldview. Human beings are not (in God's mercy) entirely logical. For a long time after a culture has swung away from God, things that logically depend on God for meaning can continue to function for us. But, slowly, they begin to fall apart, to fade away
Take some time and read his thoughts about the connection of our identities and God: Identity after God .