I have always doubted that there is one true church. My inclination is to think that good people of all faiths are equal in the sight of God, that when the 'judgement day' arrives, God will not evn take note of our church affiliation but look at our heart, our sincerity, our motives, and how closely we lived by the Golden Rule.
Somedays I'm inclined to think that our problem is that we seem to really feel that theology saves us rather than Christ. If we believe the right things (doctrines of the church) then we have an advantage. Some Catholics hold on to the believe that only in their church can people gain salvation. Brilliant men and women over thousands of years have come up with all sorts of ideas re God, Christ, scripture, authority, whatever. With perhaps a few exceptions why can't we learn from them all and give them the respect they deserve?
Then, of course, there is the debate over whether Jesus actually founded the Catholic Church specifically or the Christian church generally. I wonder if Jesus came back and saw our churches - Catholic, Orthodox, Protestant - would he recognize them as what he had in mind. Would that humble man of Galilee like our expensive altars, statues and vestments and all the repetitive ritual that has evolved since his time? Just asking.