Note that the 6th seal (Revelation 6:12-17) could be fulfilled in our future by a huge volcanic eruption (possibly of the Yellowstone Caldera) which will occur during only the 1st stage of the future tribulation of Revelation chapters 6 to 18 and Matthew 24. This eruption could begin with a large earthquake (Revelation 6:12), signaling the sudden rising of magma within the volcano. When it erupts, it could shoot so much ash and smoke into the sky that the sun will appear darkened and the moon blood-red (Revelation 6:12b), like happens during large forest fires. The volcano could also shoot blobs of red-hot magma into the sky, which as they fall back down could appear like falling stars (Revelation 6:13). And it could shoot so much super-heated ash and smoke so high and so quickly into the sky that they could form a gigantic mushroom cloud which will make the sky (the 1st heaven) look like a scroll being rolled up (Revelation 6:14). Earthquakes connected with the eruption could be so large that they set off a chain reaction of other earthquakes in nearby faults and volcanoes, which could set off even more earthquakes further away, and so on, so that earthquakes will end up affecting every mountain and island, moving each of their positions at least a little bit (Revelation 6:14b).
There are indeed 3 woes (Revelation 8:13, Revelation 9:12, Revelation 11:14).
The 1st woe is the 5th trumpet, the time of the weird, locust-like creatures (Revelation 8:13 to 9:12).
In Revelation 9:12, the 2nd woe is the 6th trumpet (Revelation 9:13), which Revelation 11:14a shows will include both the weird, horse-like creatures of Revelation 9:17-19 and the 2 witnesses of Revelation 11:3-13.
Revelation 9:13-19 will occur right before, and then Revelation 11:2b-13 will occur during, the future, literal 3.5 years of the Antichrist's worldwide reign (Revelation 13:5-18, Revelation 11:2b-3, Revelation 12:6,14).
In Revelation 9:12 and Revelation 11:14, the 3rd woe is the 7th trumpet (Revelation 11:14-15), which will announce the legal end of the Antichrist's reign (Revelation 11:15). And then out of the 7th trumpet's heavenly-temple opening will come the 7 plagues of the 7 vials (Revelation 11:19, Revelation 15:5 to 16:1), the tribulation's final stage, which will be poured out on the Antichrist's worshippers (Revelation 16).
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Regarding "the one Islam is looking for", are you thinking of the 12th Imam, also called the Mahdi?
If so, regarding the Muslim "Mahdi", during the Antichrist's rise to power, before he declares himself God (2 Thessalonians 2:4, Daniel 11:36) and begins his 3.5-year worldwide reign (Revelation 13:4-18), if he greatly increases the military and political power of the Arab world, which is mostly Muslim, many Muslims could declare him to be the Mahdi. They could do this even though he won't fulfill most of the detailed Muslim prophecies regarding the Mahdi. For the Muslim prophecies regarding the Mahdi aren't scriptural, and so nothing requires that they will all be fulfilled. Also, the Antichrist could reject the solely-human title of the "Mahdi", in his own mind, as being far beneath what he sees as his divinity. And before he declares himself to be God, if he rejects the title of "Mahdi" publicly, he could pretend to do so for humble reasons, saying something like: "Oh, no, I am not the great Mahdi, but a humble peacemaker who wants the best for all Arabs and for all mankind, no matter what religion they may presently follow", etc.
Also, the first person whom Muslims will declare to be the Mahdi may not even be the Antichrist. For before the Antichrist arises on the world stage (Daniel 11:21-45), an Iraqi Baathist General could lead an all-out war against Israel which will result in its total defeat and occupation (Daniel 11:15-17; in verse 17, the original Hebrew word translated as "daughter" is "bath"). This Iraqi Baathist General could then be hailed by Muslims worldwide as the Mahdi. But he will subsequently suffer a defeat (perhaps in Algeria), and then he will mysteriously disappear (Daniel 11:18-19), so that the Muslims could say that they were mistaken in thinking that he was the Mahdi.
Similarly, years later, when the Antichrist claims to be God (2 Thessalonians 2:4, Daniel 11:36), and starts forcing the world to worship him (the individual-man aspect of Revelation's "beast") and Lucifer (the dragon, Satan) (Revelation 13:4-8, Revelation 12:9) and an image of the Antichrist (Revelation 13:15), if many Muslims had said that he was the Mahdi, some of them could say that they were mistaken. Also, these actions by the Antichrist will result in a fatwa, a death sentence, being issued against him by radical Muslim clerics, which fatwa Islamic terrorists could then try to carry out by waging all-out jihad ("holy war") against the Antichrist. For they hold most strongly to Islam's tenets that no man can be God, that Lucifer/Satan is evil, and that no image can be worshipped. But the terrorist part of Islam (just as even the moderate part of Islam, and just as even public, Biblical Christianity) will eventually be wiped out during the Antichrist's future, literal 3.5-year worldwide reign, when everyone (not in hiding) will be forced to either convert to the Antichrist's religion of Gnostic Luciferianism or be killed (Revelation 13:4-18; 1 John 2:22; 2 John 1:7).
Also, even though Jews today don't go around killing people for religious reasons, by the time that the Antichrist declares himself to be God, some ultra-Orthodox Jews, led by a miracle-working false "Messiah", might also feel inspired to try to kill the Antichrist for blasphemy, especially when he will commit it (at least one time) even within their own (future) temple (2 Thessalonians 2:4) in Jerusalem, and he will defile that temple (Daniel 11:31,36, Matthew 24:15). The Antichrist could also sit (at least one time) in every other religions' holiest shrine and declare himself to be God there as well. For example, he could sit in Islam's Kaaba in Mecca, in the Sikhs' Golden Temple in Amritsar, in Catholicism's St. Peter's Basilica in the Vatican, etc. This could result in the radical adherents of every religion becoming so enraged at the Antichrist that they will all attempt to assassinate him. But they will all fail to defeat him, for he won't be defeated until he is cast alive into the lake of fire at Jesus' 2nd coming (2 Thessalonians 2:8-9, Revelation 19:20).
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In Muslim prophecy, besides the Mahdi, there is also "The Masih ad-Dajjal", or "The False Messiah", whom Muslims say will appear in the end times. While Bible prophecy shows that there will be multiple false Messiahs, who will be able to perform amazing miracles (Matthew 24:24), Muslims could focus on one of these, a miracle-working, ultra-Orthodox Jewish false "Messiah" in Israel, as being "The Masih ad-Dajjal", after he declares himself to be the Messiah but then (with his ultra-Orthodox Jewish followers) completely destroys the Muslim Dome of the Rock and the Al Aqsa Mosque (the 3rd holiest sites in Islam) on the Temple Mount in Jerusalem, in order to clear the site for the building of a 3rd Jewish temple.
It could be this destruction of the Muslim Dome of the Rock and the Al Aqsa Mosque, by a man whom the Muslims could declare to be "The Masih ad-Dajjal", which will give rise to the war in which another man, an Arab who could be the first man whom the Muslims will declare to be the Mahdi, will completely defeat and occupy Israel (Daniel 11:15-17).
