Ultimate , that is a big difference between the Org and Christendom. When a ( sometimes very young child) is baptised into the Org that effectively means that they are " owned " by the Org. If they do anything considered wrong they are disfellowshipped and can lose pretty much everything. That is my perception of the situation, please correct me if I'm wrong .
When a baby is baptised it is welcomed into the church family. That's it , if as an adult that child chooses to come to church or not , becomes a drug addict , thief or anything else , that person is always welcome back . In fact is never thrown out .
Jan