A form of atheism made popular by Christopher Hitchens, in his book God is not Great, Richard Dawkins, with his book the God Delusion, Sam Harris, with his book The End of Faith, and Daniel Dennet. It is a form of atheism that says that religion should not be respected but attacked.
Militant Atheism is an offshoot of atheism
Militant atheism is a term applied to atheism which is hostile towards religion. Historically, the main usage of the term refers to the doctrine advocating the propagation of atheism among the masses, as well as the combating of religion as a harmful aberration, which was often undertaken by atheist states. This application of the term was an integral part of the materialism of Marxism-Leninism, and significant in the French Revolution, the Soviet Union, and Great Proletarian Cultural Revolution.
Student: Have there ever been any antireligious extremists?
Professor: Yes, in the Soviet Union for example, militant atheism was official doctrine; churches, mosques, and temples were liquidated and those that remained were forbidden to give to the poor or carry on educational activities. Moreover, thousands of believers were imprisoned or executed.