Ted there is a lot in there so let's unpack it:

1. The Qu'ran also says nice things about Christians, and the sort of Christians Muhammed was dealing with are the sorts of Catholic-Byzantium Christians Adventists traditionally taught were in Babylon. The NT says some horrible things about Jews too if you cherry pick. 

2. "Muslim" and "Islam" literally mean in Arabic to be submissive to  God.  Technically, Adventists are Muslims. And what exactly is a "Christian"? Who says a "Muslim" culturally cannot also be an "Christian" at the same time? 

3. Your approach seems akin to a Christian supporting  Jews-for-Judaism against fellow Messianic-Jews. Your approach reminds me of Acts 15 where some said it was impossible for Gentile-Christians to be part of "Israel" without full conversion to Judaism. 

4. Re the Trumpets, Rev 9:4 suggests these Islamic invaders are not evil but doing God's work: "The locusts were not to hurt these pure commandment-keeping people" (Amazing Discoveries)