Patur,
You said: “‘m not following you. If we hadn’t stopped what we used to do then we would still be doing it because we would say that our religion demands it…. All you are saying is that our religion no longer demands it. Now it is fine to condemn them as long as you have no problem if the world would condemn us for following our religion.”
No, we would have found a reason to stop doing it. You know how I know that’s what we would have done? Because that’s what we did. We never got a direct command from Hashem to stop doing things that way, we found reasons not to (even when we had autonomy and technically could have if we wanted to).
Two people can read the same exact religious book and one will be able to find reasons why they should kill etc. and one will find a bunch of reasons why they should be nice and that killing is wrong. Both will “blame” their actions on their religious book and both will be wrong.