My mother was a not too devoted atheist. She went to Episcopal church on Christmas Eve every year, and that was mostly it.
He was an embittered atheist, the sort of atheist who does not so much disbelieve in God as personally dislike Him.
In theory I am an agnostic, but pending the appearance of rational evidence, I must be classed, practically and provisionally, as an atheist.
To be an atheist requires an indefinitely greater measure of faith than to recieve all the great truths which atheism would deny.