Let me quote one of the most avowed atheists in history:
"...you must remember that religion is an early form of philosophy, that the first attempts to explain the universe, to give a coherent frame of reference to man's life and a code of moral values, were made by religion, before men graduated or developed enough to have philosophy. And, as philosophies, some religions have very valuable moral points. They may have a good influence or proper principles to inculcate, but in a very contradictory context and, on a very—how should I say it?—dangerous or malevolent base: on the ground of faith."
"Playboy's Interview with Ayn Rand," March 1964.
[The reason she calls faith "dangerous or malevolent" is because faith is the abdication or renouncing of reason. It was the 5th/6th century theologian Boethius who convinced Christians to "join, insofar as is possible" faith to reason, because he knew that the bare faith by which Christians believed up to that time would not be enough to sustain their religion much longer.
[His students, the "Scholastics," took that "joining" to the extreme, and after 8 centuries or so became ridiculed to the point that they were one of the problems of the Church against which Martin Luther railed."]