Leftism is self-exterminating, but it will take a while, and they will continuously try to convert the children of conservatives to replenish their numbers.
While it may be true that the Muslims have higher rates of reproduction than the Christians and the atheists, that is not the reason the Europeans are dissapearing.
The reason is that the foreigners are being indiscriminately allowed to enter Europe. The power brokers sold us a tale that cheap labour is needed for the economy to function. When labour becomes expensive the economy will work just fine, but the rich will gain less wealth.
Leftism is self-exterminating, but it will take a while, and they will continuously try to convert the children of conservatives to replenish their numbers.