You’re right that regimes like the Soviets and Communist China committed atrocities to maintain power, but removing God made that kind of unchecked power possible. Without a higher moral authority, they weren’t just suppressing rivals, they were eliminating any competing source of truth, meaning, or accountability. Atheism wasn’t the sole motive, but it created the vacuum where the state could become absolute and conscience could be crushed without restraint.
The same pattern is true of much religious violence throughout history. It was often about control, not genuine faith. Leaders used religion as a tool to legitimise their power and eliminate competition. That wasn’t obedience to God, it was a distortion of belief for political gain.
The difference is this: when religious violence happens, it usually violates the core teachings of the faith, especially in Christianity, where Christ taught love, mercy, and nonviolence. But when atheistic regimes commit violence, they aren’t violating their worldview, they’re often acting entirely in line with it. Without God, there’s no moral limit to what can be justified in the name of progress or power.