Yes I pick on all religions.

[Michael]

And where is the book of atheist dogma commanding its followers to kill?

Must have missed that somewhere.

With respect, I suggest you read a little into the history of the 1920/30s persecution of Christians by Stalin. Marx himself did not strongly advocate suppression of religion*, but Lenin, building on the political views of Marx and Engels, very much thought that atheism must be adopted and spread. Lenin believed that the ideological battle against faith, religion, and the Church must be won through strong active atheist propaganda and campaigning. This did not meet with large success, so Stalin in the late 1920s and early 1930s started on a much more aggressive persecution of Christians with the express aim of replacing religion with atheism. To say that the persecutions under Stalin had nothing to do with atheism is simply burying one's head in the sand and saying the sun can't be shining because you can't see it. You might as well say that the inquisitions had nothing to do with the religious beliefs of the Spanish church and monarchy. We all, atheists and theists alike, need to acknowledge when our ideologies have led to dark places; only in doing that can we work to prevent a repeat of the terrible atrocities of the past.

*Marxism itself is open to a Christian form, that of 'liberation theology', which was prominent in South America in the last century. Catholic theologians in South America found strong links between Marxism and Jesus's call to care for the poor. It was Lenin and then Stalin that took Marxism down a much stronger atheistic and anti-religious path.