most of Westerns i meet here RF, they are athiests or non-ChristiansThere are also huge numbers converting to Christianity still. As far as I know it's the only one getting very big numbers by conversion rather than birth. Where I live there is a church every two or three blocks down a road and they are always well packed on Sundays. Even the big ones with over a thousand every week.
It would take another century at least for atheism or anything else to make a big dent in Christianity without some catastrophic or apocalyptic scenario taking place.
i believe athiesm is impact on Christianity population in West