The change came in the 50s when Barnhouse and Martin studied Adventism two books were printed one by the General conference called 'questions on doctrine' and the other by Barnhouse and martin called 'The truth about seventh day adventists' . These books were sold to Adventists and in christian book stores. These discussions brought evangelicals and evangelical adventists closer and with greater understanding.
one factor that brought confusion was that Adventists have a range of beleifs from Arianism to the Trinity which exists even now and the evangelicals were unsure of what the offical position was because they presented papers with the church logo which presented both views. SDAs also have differing views on the gospel the coservatives teaching a works based salvation similar to the catholic church while the rest teach the protestant gospel of righteousness by faith.