Antitheist atheists aren't "secular". Their religion is atheism. It forms their worldview and emboldens them to lash out at the other "false" religions of the world.
It is our duty to do even more than we have done to make the antireligious movement, not only in the USSR, but in the capitalist countries as well, a movement of vast millions. We are entering the sixteenth year of the proletarian revolution with great gains to our account in the field of atheism. But these gains are insufficient; our work must be improved, consolidated, expanded, deepened. The banner of militant atheism must be raised still higher. Propaganda in favor of militant atheism must be carried on more widely, must become deeper and more serious. The ranks of the militant atheists must be increased to include millions. Remember that the struggle against religion is a struggle for socialism!