Not entirely true. When the USA came to Iraq (for wrong reasons and lies), Iraqis started killing each other. When USA came to Afghanistan (they shouldn’t have done that), Afghans continued killing each other.
When the US and it’s proxy Saudi Arabia entered the war in Yemen, Muslims (Iran vs Saudi Arabia) started killing each other on a massive scale.
So it wasn’t the USA that killed most Muslims. Muslims started or increased killing Muslims. On behalf of the USA. With American weapons. Paid by Muslims (in case of Saudi Arabia)
It’s an unconvenient truth maybe, but America didn’t kill millions of Muslims. Muslims did. Because for a part they wanted to please the USA. Or they wanted to avenge what happened in the past.