The definition of an atheist is one who does not have a god-belief. That is all. You are an atheist in relation to Allah, Zeus, etc... It is not a religion, not a world-view, not an agenda - it is, well, nothing. As I have said many times, the only time in my life it even blips into my brain that I am an atheist is on the DP when I am discussing divisive material. So, no, there is nothing to "practice". I haven't met or spoken with a fellow atheist in person, that I know of, in years.
Another mischaracterization without any evidence, and on purpose.
Someday, you will learn the value of honesty.
"In the beginning of a change the patriot is a scarce man, and brave, and hated and scorned. When his cause succeeds, the timid join him, for then it costs nothing to be a patriot."--Mark Twain