If the assertion that there is a god is nonsensical, then the atheist's assertion that there is no god is equally nonsensical, since it is only a significant proposition that can be significantly contradicted.
The secularists have not wrecked divine things; but the secularists have wrecked secular things, if that is any comfort to them. The Titans did not scale heaven; but they laid waste the world.
To justify Christian morality because it provides a foundation of morality, instead of showing the necessity of Christian morality from the truth of Christianity, is a very dangerous inversion.