I cannot argue with this. If you press the point, the Christian, or idiot, will try to draw you into an argument over the existence of his god, assuming naturally enough that this is the point of your atheism. Too often an atheist will fall into this idiot game. Such theological quibbles are seen for what they are by other cultures.
Atheism is a world-view, with profound implications.
To explain what this means, let me show how one real atheist spent his life. Thantai Periyar E. V. Ramasami was born in the Indian state of Tamilnadu in 1879. He noticed as a young man how the inequitable caste system had permeated the Hindu, Muslim, and Christian religions. Members of this caste were denied education, participation in social and governmental activity, and contact with other castes, except when their services as scavengers, hide-flayers and cattle butchers were required. From questioning, Periyar moved to rebellion from the 1920s onwards.