Thanks for explaining the reason behind why its not liked. But I still don't agree with the fact that people should make up their own laws regarding religion.
Like, just because the priests had problems with property and inheritance, it shouldn't be a sin on the rest of the priests who may find it easy to support their children. Unless its something sinful which was ordained by God, or Jesus (peace be upon him) - then it shouldn't be a sin, and men shouldn't have the right to create laws, only God or his prophets.
This is why in islam, we don't follow the whims/desires of other men, but we stick to the authentic two sources for our guidance; the Qur'an (the word of God) and the Sunnah (ways of our beloved Prophet Muhammad, peace be upon him.)
Our laws can only be derived from them two sources, and no other law is acceptable except through them.
I hope you don't take offense to what i'm saying, its just that its too complicated to follow the ways of people who want to create new laws in religion. How does the person know who to follow? This is why, its important to stick to the main sources that were by God, and His messengers, and no-one else.