Why would blacks want to destroy White Christianity? Blacks rule the roost with their religiosity and perhaps virtue in America, according to The Huffington Post April last year:

" . . . while many predominantly white mainstream churches suffer severe membership losses, black Americans appear to be keeping the faith.

Compare the religious lives of black and white Americans:

•Seven in 10 black Americans read the Bible outside of worship; just 44 percent of white Americans open Scripture on their own, the Bible in American Life study showed.
•The 2012 General Social Survey found nearly half of blacks reported praying several times a day; just 27 percent of whites prayed with the same frequency.
•Fifty-one percent of blacks, compared to 37 percent of whites, strongly agree that they have a personally meaningful relationship with God, according to the Portraits of American Life Study.
•Fifty-nine percent of members of historically black churches reported attending services at least once a week; nationally 39 percent of Americans reported attending with similar frequency, according to the 2007 Pew U.S. Religious Landscape Survey.
•The percentage of white religious “nones” — individuals with no religious affiliation — rose from 15 percent in 2007 to 20 percent in 2012, while there was no statistically significant change among black Americans, Pew religion surveys found."

According to this, if there's any destroying, white Christians seem to be doing it to themselves.