Which version are you talking about? Catholics are very pro-sex. They want you to have lots of kids. It seems like liberal secularism is the death cult. With abortion, anti-children, and pro euthanasia. That why Western Europe is dying. It will be gone in a couple hundred years.
According to Nietzsche, Christianity is the death cult since it is opposed to some basic things required by all living things; greed and selfishness.