I have been thinking about this all day and I have come to several conclusions.
I believe that the Catholic Church is the one true visible Church established by Christ and rightly ordered through time. My faith in the Catholic Church is as strong as I am sure your faith in the LDS church is. I believe that the fullness of Christ teachings are found in the Catholic Church. And I do not think that this belief is in anyway compromised by recognizing all those who attempt to follow Christ as fellow brothers and sister and members of Christs body.
Certainly on a theoretical/theological level I can see reasons why one might have serious concerns over the nature of baptism and membership in Christs Church because such questions may very well prove to be key in our salvation. I think that they are important and I dont want to diminish the theological aspects of the questions. But from a practical standpoint I just dont see the issue as being all that important. In light of the other recent thread concerning whether LDS are Christian or not, and this thread I just dont see how arguing over who is Christian and who is not is going to get anyone anywhere. And I cannot, I will not, deny the title of Christian to anyone who sincerely attempts and desires to follow what they see as the teachings of Christ.
I believe that it is impossible for humans to do any good things apart from a participation in Gods grace. I believe this is a solid Catholic teaching (God help me if I am wrong). Any one who does anything good, in my mind, has participated in Gods grace to do it, whether they know/believe it or not. Christ said that you will know them by their fruits, that He is the vine and we are the branches. I see many Catholics, members of the visible Church, who are villains. Throughout the history of the Church and even today, there have been withered branches that produce no fruit within the Church. I look upon non-Catholics and I see good fruit all day long and I cannot deny the working of the Holy Spirit in them. Membership in any church does not guarantee Christian behavior. And although I do feel that being a member of the Catholic Church provides one the greatest opportunity and the most and best tools for achieving true Christian behavior, I do not think that Christ will reject anyone who has followed Him no matter what path they took. I will close by pointing to the most relevant biblical passage I can think of, Matt 25: 31-46 and Matt 7. A few key verses:
Matt25
37"Then the righteous will answer him, 'Lord, when did we see you hungry and feed you, or thirsty and give you something to drink? 38When did we see you a stranger and invite you in, or needing clothes and clothe you? 39When did we see you sick or in prison and go to visit you?'
40"The King will reply, 'I tell you the truth, whatever you did for one of the least of these brothers of mine, you did for me.'
Matt7
18A good tree cannot bear bad fruit, and a bad tree cannot bear good fruit.
21"Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but only he who does the will of my Father who is in heaven.
I still have much to learn on this matter of the visible church and the mystical body of Christ. I understand the concepts as such but do not understand them in practice. I do not think, however, that any harm can come from recognizing the LDS as brothers and sisters in Christ if it is done out of love and charity. I know we have many differences but we both worship the same God and recognize Jesus as His son. I dont know... I am just so very ignorant and have much growing to do. All that I know is that in my heart it feels right to accept with open arms all those who proclaim Christ as their king and even those who do not. I desire to see all people saved, I desire to see all peoples in paradise with God. I believe that Jesus was telling the truth when He said that He was the way the truth and the light and that no one can get to the Father except through Him. And I believe that God desires the salvation of all people. So I must therefor conclude that there are many ways to Christ. Some ways are better than other (of course I think Catholicism is the best) but still many ways to get there. Anyone who knows where they are headed (to Christ) is a fellow pilgrim on the journey and the Church is the pilgrim church on earth. Even if everyone has slightly different versions of the map (religion) the destination is the same and I am more than happy to recognize those who travel along the way as fellow pilgrims.
God help us all to reach our common destination.