Question 1. May someone who claims to believe in God support BLM? Q2. May a Christian support BLM? The answer is each case is a firm, no!
Why not?
Marxism is in direct opposition to any belief in God; it is definitely Anti-God, Anti-Christ, anti-family, anti-freedom, anti-property rights…; those are the highpoints. You cannot support a communist organization such as BLM, Freedom Road Socialist Organization; the CCP Progressive Association…and at the same time stand for the opposite (unless you do not understand what Marxism is about, and in that case, you only thought that you could do such a thing, out of your own ignorance about Marxism).