The One True Church of Christ: The Visible and Invisible Church

A common experience for many Christians is to encounter another believer who seems to think that their church is the only true church, and outside of that particular church (or ones like theirs who have similar names, traditions, or practices) there is no other true church. Some might go far as to say that others who belong to different churches may not even be saved.   So what is the one, true Church of Jesus Christ? Out of the roughly 45,000 Christian denominations, tribes, and traditions- which is one is the “true Church”? And how do we have conversations and dialogue with Christians who happen to think that their tribe is the only one doing things right?