[CodeToad]

The single most important thing protestants are tired of hearing from Catholics: “You ain’t a Christian if you ain’t Catholic!”

[Petrosius]

The single most important thing protestants are tired of hearing from Catholics: “You ain’t a Christian if you ain’t Catholic!”

I have never heard a Catholic say this and I would definitely not say it myself. Catholics might say that Protestants are in error or even heretical but they are generally recognized as fellow Christians.