A vast majority of African-Americans and Hispanics are religious. Watch the Dems lose their support when all of a sudden their churches start being taxed. Churches do a huge amount of good in their neighborhoods, and around the world. A vast number of charitable organizations are founded on religious principles as well. Will they also lose their tax-exempt status.
By the way, churches still pay pay-roll taxes and sales tax. It is only donations that they are not taxed.
on edit: I have removed Property Tax. It seems that I was wrong about that. Mea Culpa.