I’m talking about Western Civilization. Western Civilization will sustain mass conversions from Christianity to Islam. The West is a spiritual vacuum which will be filled. Besides nothing exists to stop the conversion back to Islam, in Africa, by force or persuasion. It is ongoing right now.
This writer begs to differ:
http://www.goodreads.com/author/show/3252981.Philip_Jenkins
He does point out that the Christian faith is growing bigtime in Africa and in Asia, such as in China, India, etc.
He is very good.
Yet with more attacks on Christians, it will plant the seeds for new believers.