If I recall he claimed to be an atheist.
That changed.
If he remained so, he is not anymore.
Perhaps as a younger man, but I recall listening to a show on which he succinctly explained why atheism was wrong.
“Looking at the Roman Catholic faith, I was unable to distinguish its assertion of a virgin birth, a return from the dead, and the bodily assumption into somewhere outside the universe of a man and his mother from among similar pagan superstitions. My last fear, the fear of God died with my faith. I was now alone and would have to live life armed only with my own inner resources. I felt a surge of confidence and resolve like that I had experienced years before when I conquered my fear of lightning. I was free.”G. Gordon Liddy, Will: the Autobiography of G. Gordon Liddy”
Not that I ever heard him say.................He was a Catholic, old style.................