Christianity Offially on the UP in England and Wales

[Beskar]

And before you rush to the old "but they didn't do those things in the name of atheism", it's worth pointing out that the Thirty Years War wasn't a holy war as such, but rather a political conflict influenced by/divided along religious lines. In much the same way that Hitler (it's a Godwin, so deal with it) and Stalin didn't do what they did in the name of atheism, their respective ideologies were heavily influenced by atheism and the ideas that were at the time associated with it (social Darwinism etc).

Hitler was against atheism and is a Christian. (Linked his faith to Catholicism too)
Stalin didn't actively promote atheism in anyway and infact, reintroduced the Orthodox Church to Russia.

Spoiler Alert, click show to read: 

So both Hilter and Stalin were Christians! Hitler also called the Jews 'Christ Slayers'.

History just came back and bit your ignorance in the behind. Know your history before you make such wild assumptions.

Even then, Atheism is still not predominate, so your claims as such are false. Catholicism was still far more dominate, which is why both Hitler and Mussolini had dealings with the Catholic church, even then in Russia, the Orthodox Church returned in force and the Russian Patriarch was reformed under Stalin.

There has never currently been a time where atheism has or is predominant. It is only predominant in intellectual circles currently and a few of the younger generation which hasn't been exposed to the same dogma of the past.