Eliminating the Islamic practice female genital mutilation will improve Muslim women’s sex lives. One thing U.S. Christians can do is invite a Muslim family to church. Maybe the family will come back and choose to identify Christian.
Of the 3.5 MILLION Muslims in the U.S. about 100,000 abandon Islam each year.  More than half of Muslims living in the U.S. abandon religion entirely and 22% now identify as Christian.
Ex-Muslims living in the west spread savvy messages, denounce Islam and help atheists flee to the West says Daniel Pipes in WSJ article When Muslims Leave the Faith.