There have been schisms since the first century, and they will go on till Christ returns. Christ will keep true to the prophecy though, the Gates of Hell shall not prevail against the Church.
I'm not sure what to think of Fr. Seraphim Rose, I haven't read much of what he has written (and how he lived). I'll say that someone needn't necessarily be a canonized saint to be your patron saint, though. As an example, when I asked about Justin Popovich being my patron saint, my Priest asked me to find out if he was officially a saint in the Serbian Church (which he was/is a part of). He isn't officially a saint, but my Priest (the day of my chrismation!) made an exception and allowed him to be my official patron.
Regarding Saints, this might be a place to start at: http://www.ocf.org/OrthodoxPage/reading/St.Pachomius/