Heresy Has Always Been An Option

Interesting points:

I've often heard Protestants who admire such figures [Augustin, Francis of Assisi, etc.] explain away their Catholic allegiances and beliefs with the excuse: "Well of course, all Christians were Catholic at that time; there weren't any other options." The only problem with this is that there were other options. There have always been groups outside of the Catholic Church that called themselves Christians.

Read the rest here.