I am a Catholic. Why should I consider becoming a Christian?
I now know more distinctions (apparently Catholicism requires duty and salvation is process, unlike Protestantism?) but I still think they're of a similar branch (Christianity) so I just wonder the social factor
This might be a regional thing. At least in Germany, where the reformation took place, the term Christian include all groups, protestans, catholics, orthodox etc.
In Austria, when people say "Christian", I'm convinced that 90% of people only think of the Roman Catholic Church. Even though the term includes all groups.