I think that we all are fairly certain that our beliefs and doctrines are correct because if we thought them in error we'd change our view and then they'd be correct again (yes, I learned that one from MacArthur). That said, from discussions on this forum it is apparent that most of us believe that there are churches that differ in secondary doctrine, yet still hold to the gospel of Christ (that there are legitimate churches out there who hold different theologies). I believe that the Church is united in Christ, therefore true gospel believing churches should feel a sense of unity in Christ with one another while still holding firm to their distinctive beliefs (until such time as they determine it is error). I wonder how many of us would feel comfortable to worship with other denominations that we believe to be brothers in Christ and what, if any, those denominations would be. What church denominations outside of your own would you consider visiting to worship alongside? What denominations would you consider to be Christian and yet not entertain setting foot in their door, and why?