Yep, that happened. And as someone else has noted, the whole international campaign to make slavery illegal was also largely driven by Christians. (I can't claim much credit for my own denomination; it was mostly the Quakers and Methodists who did that.)
The overall lesson here, I think, is that finding a way to justify bad actions using the Bible (or any other source) doesn't make the actions good or just. In the same way, finding an excuse to claim someone else's actions are evil using our interpretation of the Bible (or any other source) doesn't necessarily make the actions evil.
Good and evil are still concepts we argue about. When, as illustrated in the Garden of Eden myth, humanity acquired the "knowledge" of good and evil, that just meant we acquired awareness of the labels, and the ability to argue about them--not any innate ability to be sure which is which.
The problem of deciding which is which is argued about in the rest of the Bible (everything after Genesis chapter 3) and throughout the rest of human history, including Christian history. So far, the best decision principle we've got appears to be the Golden Rule: treat others the way we (if we were in the same circumstances) would want to be treated.