The short answer to this question is, yes. If you are a Christian at the time of the rapture you will be taken to heaven. If you are left behind, you are not a Christian. This question was addressed earlier, read more here.

Let’s talk about the Army of God.

This is an excerpt from a GotQuestions article referring to the army.

“Jesus Christ will return to earth with the armies of heaven (Matthew 25:31; Revelation 19:14); His feet will stand on the Mount of Olives (Zechariah 14:4); He will defeat the forces of evil (Revelation 19:15–16); He will cast the Antichrist and the false prophet into the lake of fire (Revelation 19:20); He will bind Satan; and He will set up His kingdom on earth for 1,000 years (Revelation 20:1–6). At Armageddon the Lord Jesus Christ “treads the winepress of the fury of the wrath of God Almighty” (Revelation 16:19), and all things will be made right.”

Note who is doing the work in this battle. He will defeat, He will cast, He will bind, He will make things right.

Here is more information on the “Armies of Heaven”.