Why did communists fear/ban religion in the russian revolution?

Well the Russian had many imiragted in there countries many of which worship various regilon. Some of the reglion rebel the idea of communists the fear the people would unite to a greater cause and overthrow the government 

Iam a german monk and professor of theology. i believe that the catholic church's practice of buying forgiveness of sins through indulgences is wrong. i have translated the bible into german to make it easier for more people to be able to study it. i am here to stand by my writings and i refuse your demand that i recant them