I don't like this no true scotsman crap with Christianity. If you think Israelis went from oppressed to oppressor in record time, Ima introduce you to this Constantine dude who flipped the script in an afternoon. Because Jesus did what? Helped him in battle.
From that day forward, militant, violent, and expansionist Christianity was the norm. All that crap about the poor is just the "slave morality" that's naturally shed once on has power. They didn't betray Jesus, they upgraded him to a god of war.