The Differences Between Catholicism and Christianity

I'm curious, what is the essence of religion? What makes a religion a religion? And how much can you take away before it's not a religion anymore? So when people are arguing against like, how can our Catholic ministry be supporting Black Lives Matter because we're supposed to be racist? Is that like what they're saying? Are they referring to somewhere in the Bible or whatever materials you're looking at as evidence or does it get all muddled with their own? Yeah, political, personal biases. I think Biden, President Biden has been noted as the first or one of the few Catholic- No JFK.