Yep, such is the nature of the great falling away.
There is one essential difference.
Protestantism teaches its OK.
Our Church still teaches, as did all of Christianity for all time, that contraception is inherently wrong. And the tide is quietly turning in our Church, as the faithful increasingly realize the Church is still right on this issue.
One Church stayed faithful, one fell into apostacy, at least by the yardstick of orthodoxy in moral theology regarding marriage and human sexuality.
If one desires to argue that the vast majority of Christians have spoken, and rejected the traditional teaching of Christianity on contraception, that's OK.
The debate then becomes, is that rejection of a continual teaching accepted by all Christianity common sense, or is it common apostacy.
If its the latter, which Church did not fall into that apostacy?