There's no bigger atheist than me. Well, I take that back. I'm a cancer screening away from going agnostic and a biopsy away from full-fledged Christian.
In your intercourse with sects, the sublime and abstruse doctrines of Christian belief belong to the Church; but the faith of the individual, centred in his heart, is, or may be, collateral to them. Faith is subjective.
Christian theology teaches the doctrine of prevenient grace, which briefly stated means this, that before a man can seek God, God must first have sought the man.