Corinthians, Acts and Romans makes it pretty obvious that the last thing we should be doing, as a church, is telling churches who do things a little differently how wrong they are. We aren't supposed to argue over the little things....it doesn't matter what church you belong to so long as you use the bible as your guide and seek after CHrist honestly. If you do that, the minor differences between say the Church of Christ, New Testament Baptist churches, Southern Baptist, Presbyterian, Methodist, are pretty minor.
There's no doubt there will be some discussion at the end of what is TRULY proper and right when it comes to worshipping God...after all, God will be there to explain it....but I don't believe God will exclude people from heaven, if they are truly saved and made an honest attempt to live by the Bible, based on whether they're Seventh Day Adventists or Church of Christ parishioners.