Needless to say I disagree with both notions that you expand upon.
Where persecuting a religious ideology out of existence is concerned, the lessons of history are on my side. This is not possible without complete genocide. Social evolution, sound education, financial comfort and a hopeful future are the elements that undo religious thinking. The USSR were unable to provide the majority of those elements, so they sought to persecuate organized religion out of existence and this with the full weight of all the governmental apparatus. They failed. They merely drove religion underground where its proponents actually strengthened their resolve.
Given the tyrannical rule, with all its attached miseries that the Russian people had endured for centuries, the removal of religious thinking was imo a noble goal. As usual, the USSR, as is the US at present in Iraq, was incapable of recognizing that the use of force in these situations is counterproductive.
On your second point:
If we associate Atheism with nonbelief in a nonmaterial dimension, or spirit, as it often manifests, then there is an issue here with being spiritual without believing in spirit wouldn't you say?
Your Wikipedia (perhaps just a starting point for knowledge!) quote is selective. Read further and place the whole of the quote into the equation and you will see that you deliberately chose the most narrow understanding of what spirituality is - the Wikipedia entry iself bears witness to this narrow definition. As I have no axe to grind, well, my defintions are of course more accurate.
Art, music, poetry, nostalgia, love, creativity, ae all imbued with the spiritual, that is a focus outside the material. So you see, every person can be spiritual, whether they be religious or not. The USSR sought to reign in organized religion and according to Herbert Marcuse the essense of true spirit would then manifest itself. I have little sympathy with what happened to religious bodies in the USSR, they got all they deserved.