I literally am a black leftist in GA. I, nor the first person said to alienate nor abolish religion. Op said to stop giving religion money, and I pointed out giving money to religion is better spent giving money to organizations that directly help, and specifically help.
There are also organizations working towards making communities for black people who aren't religious, such https://blacknonbelievers.org/
I welcome religious people and churches helping out, and I'm not going to say anyone should reject such help. I am saying, that as a religious or non religious person, directly giving to organizations that help specifically would help much more than giving to a religion. It's similar to say the difference between getting ad revenue and Patreon or other direct donations. The latter is more effective.
Lastly, I will say there definitely is a critique of religion, in that many either way into a global fund/membership that donates to organizations that have contributed to where we are now, or directly do so themselves. Can I gaurantee every single one does? No, mainly because as I pointed out they have special rules where they can hide where their money goes. Some small unaffiliated churches may be completely clean.
However, those aren't even the ones you are talking about, since you specified the large populations of religious people in the south. Those standard denominations definitely gave to anti LGBT, anti abortion, and donated to have exceptions in law carved out for themselves, which significantly contributed to GOP effort to stiffle freedoms. That money helped Trump