II Corinthians 11.4
For if he that cometh preacheth another Jesus, whom we have not preached, or [if] ye receive another spirit, which ye have not received, or another gospel, which ye have not accepted, ye might well bear with [him].
http://www.cbn.com/cbnnews/world/2011/March/Iranian-Regime-Video-Says-Mahdi-is-Near-/
While the goal of Muslims is to as they say here "...instigate uprisings..." our goal is to preach the gospel and glorify Christ Jesus. Here is how the Lord Jesus Christ shall appear:
...when the Lord Jesus shall be revealed from heaven with his mighty angels, in flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ: Who shall be punished with everlasting destruction from the presence of the Lord, and from the glory of his power: When he shall come to be glorified in his saints, and to be admired in all them that believe (because our testimony among you was believed) in that day. II THESSALONIANS 1.7-10
Here's the mythical coming of the 12th Imam or "Mahdi":
