I've never come across anything that would separate my faith (as a Protestant) from that of a Catholic. But both have come a long way. The differences seem to me to be more on an emotional level. There are some traditions that seem strange to me, mainly because I don't find them in the gospels. But 'strange' and 'wrong' are different things.
My view is that if even Israel themselves could miss the boat, then neither Protestants nor Catholics, or any other denomination, should stake too much on their uniqueness or "spiritual property". Faith isn't proprietary to any religion or denomination, it belongs to God. What makes any Christian faith "unique" is that it was made possible by God, and God alone. It's His Spirit than binds us together as one body, under one faith, and to break that body would be to crucify Jesus again. There might be valid objections and misunderstandings on both sides, but none more valid than what we agree upon.
Catholics and Protestants are like the left and right hand of Christ, both were nailed to the same cross. We were spread apart over sin, but no futher than His feet, which is everybody who proclaims the Good News that our Lord has died for our sins and risen from death to justify those who believe in Him. No church can make this message unavailable to anybody, it can only represent the availability of that salvation.
PS. Okinrus, we accept two sacraments: baptism and communion. We see marriage as a divine institution, but not a sacrament. I'm not sure what that means to you, so maybe you could help me out?