Correct. If a church is teaching something you don't believe, you're in the wrong place.
Does it mean that there are no truly authoritative figures in Protestantism?
Correct. The only recognized authority is Scripture. Like the Bearens, we search Scripture to see if someone's teaching or preaching is supported in it.
Much of what Catholics might consider to be anti-Catholicism is actually our "process". We don't just challenge all of the teachings of the Catholic Church, we put our own churches (and the churches of others) through the ringer.
That is interesting. I cant say it makes any sense to me. Churches that vote up or down on ancient teaching are just something I can grasp. Why would that be appealing? And having each individual person be the ultimate arbiter of the meaning of scripture again makes no sense to me? Why would Jesus leave things in such complete disarray?