As a former Adventist I may be able to help here.
Jwop, All christians are taken to heaven at the second comming.
The lake of fire is where the satan and also the wicked are punished at the end of the thousand years. This is not a punishment for ever and ever but only for a time determined by God.
jThe paradise on earth is for the faithful after the thousand years.
Yadda Yadda, I beleive most Adventists would see shunning as unchristian I have not experianced it and I haven't even heard of it being used.
Da Cheech, Adventists only observe the sabbath not the other jewish festivals. The reason Adventists have the sabbath is because its on e of the ten commandments and separate from the rest of the jewish law. Barry