Truther, you're missing the forest for the trees.
The Early Church Fathers WERE Catholic, as were ALL Christians in the first centuries. There were NO OTHER Christian churches then. NONE. ZERO. NILL.
The Orthodox splintered off in 1054 A.D. Here's a video explaining what happened then:
Protestantism didn't start until the 16th century and has continaully strayed from the fullness of truth Christ gave mankind.
BTW, if you want to be accurate, the offical title of the Church isn't the "Roman" Catholic Church. It's just the Catholic Church. The "Roman" part was proposed in the 16th century by Protestants (Anglicans, if I recall, but I'm not 100%?) as an insult.