Not sure there needs to be a seperation between Christian believers. I would say that all should be welcome if they want to worship with us ... not matter how they viewed the State of the Dead.
That should go without saying. By "separation" I don't mean that we have nothing to do with those who think differently or that they are not invited to worship with us.
The important thing is that we believe in the Bible. We as SDAs have a wide difference of thought in regards to Righteousness by Faith for example. The doctrine of being Saved by Grace is as important as it gets ... yet many in our church do not accept this.
Who in our church do not accept this? Perhaps some individuals have a view of it as different from yours or from mine, but that doesn't mean they don't believe in being saved by grace. You may be talking about some of the details in the doctrine, about which it is not necessary for everyone to have perfect agreement.
I hold the door open to all those Christians ... even those who don't believe as I do in Salvation by Grace. I would not want to create a barrier to those people. I've found that those who believe in Salvation by works are most sincere. And I welcome them in church because ...
The Wheat and Tares will grow together till the harvest. And they are to have the full advantage of the sun. We are to be close to them and witness of the Son to each one.
Of course we welcome everyone to worship with us. That is not the question, is it? I thought the question is why have the 28. We have the 28 to draw a distinction, so people will know we believe in certain distinctive doctrines. If we didn't say so, how would anyone know to join us in our beliefs?