The activities of Islam as judgments (i.e. trumpets) against the Christian church are due to the departure of Christians through their history from truth.  Rev. 9:20-21 tells us that the survivors of these judgments still did not repent of their idolatry, murders, sorcery, immorality, etc. -- thus, implying that the intent of the trumpets is to bring Babylon back to truth.

It is my contention that rather than hiding this information, it could be used -- if presented properly -- as a method of winning Moslems to Christ as they would see their historical role in prophecy written prior to Islam's existence, and thus inspire confidence in the Bible.

We did not write the prophecies.  The Book of Revelation comes from Jesus Christ.  He obviously wanted us to have certain understandings.

We do a disservice to people if we water down the Gospel to be amenable to any and all points of view -- even illogical and contrarian -- for then, we give quarter for them to continue in error.