Religions have always been changing. If that is your benchmark then there isn't a religion out there with any credibility. For example Christians don't stone kids for being disobedient, they also don't threaten to kill people who suggest a heliocentric solar system . Many Hindus don't follow a caste system anymore, Muslims don't go around killing non believer's(well vast majority of them). Are these bad things?
I think you clearly do not understand the religions you speak about. In Hinduism, the act of Sati, as far as I recall was a cultural practice rather than a scriptural teaching. I'm not sure what stoning of kids you refer to but I assume whatever you have in mind comes from the OT which is seen as abrogated as a practice with the coming of the NT according to Christian theology and as for Muslims...there's context - the Islamic texts (Quran and Hadith literature) are something that have contexts.
However, if you wish to further know about a particular passage then go to the relevant scholar/religious leader and ask them.
Are religions always changing? I think if a religious textual body has scope for a certain opinion and that opinion is sincerely arrived at by the relevant theologians then that is not necessarily a change in the religion.
The issue here is not about accepting a certain opinion in a spectrum of theological opinions concerning a certain text but rather whether somebody is being intellectually honest.
There's an interesting book by Dr Jonathan Brown on this type of topic.