Wa alaykum salaam
No, I don't know what sect of Christianity followed Simon Peter. The Unitarian theology is pretty close to the truth, but they reject the Virgin birth and other miracles, claiming they are merely symbolic ways of speaking. Maybe the sect that followed Simon Peter died out. I think it did, since all existing sects are based on the Bible, which is majorly the teachings of Paul, who was opposed to the teachings of Peter. Maybe that was the reason that Prophet Muhammad (saw) was sent.
As for all the stray sects being thrown in the fire...it's possible that they will be thrown in a purgatory form of hell and not into eternal hell. Allah (swt) knows best.
I don't speak without proof. Here is a list of the 13 sects which have accepted the loving and kindness of Imam Aly
. The sect that is the right one will have no beliefs contrary to the Quran and reason.
1. The Druze: A branch of Ismailism. Believe in reincarnation. They do not accept converts to their religion and keep most of their beliefs secret.
2. The Alawite: Also known as Nusairis by other muslims. Claim to be Ithna'asharis. Believe that Imam Aly
was God and that there are/were other incarnations of God. Keep most of their beliefs secret. Do not accept converts
3. The Zaidis: They take Zaid bin Aly, brother of Imam Muhammad Baqir
, as their 5th Imam. It is interesting to note that the sect was started by the companions of Zaid
and Zaid himself rejected it. He
accepted the Imamate of his brother.
4. The Alevids: Claim to be Itha'asharis. Keep most of their beliefs secret. Believe that faith, without actions, is enough to get salvation. They do not pray, pay zakaat or perform hajj. Consumption of alcohol is allowed and they drink during their religious ceremonies.
5. The Bektashi: Claim to be Itha'asharis. They are trinitarians, holding that Allah, Muhammad and Aly are one entity.
6. The Qilzibash: Claim to be Ithna'asharis. Hold that the 12 Imams are divine and that one of their leaders and founders, Ismail, was also an incarnation of God.
7. The Fatimid: I do not know much. Will find out and let you know later. Or you could find out for us.
8. Nurbakshi Kubrawiya: Same as above
9. Oveysi Kubrawiya: Same as above
10. The Hamadani: Same as above
11. Nizaris: Known as Ismailis. Their kalima adds the phrase 'aliyullah' to the shahadatain. This means 'Aly is Allah'. They do not practice Islam. (Do not pray, go for Hajj, etc). They do sajdah to Aga Khan, who they believe is the Imam and the incarnation of Imam Aly
and God.
12. The Bohora: A form of authoritarianism. The leader, called the Dai, is supreme and must be obeyed under all circumstances. What stands out the most about this sect is the fact that they take what the Dai says as absolute truth, even if he says the sun revolves around the earth (they really do believe that!). They are not allowed to question anything. They are not allowed to read the translation of the Quran, for fear of mistranslation. Maybe someone is trying to hide the truth from them.
13. The Ja'fari Ithna'ashari: The mainstream Shias- us. The logical, reasoning Shias.
It is reported that 'Alí ('a) said, "The Apostle of Allah said, 'The example of you in my community is as the example of Christ Jesus the son of Mary. His people split into three parties: a party of believers, and they were the disciples, a party of his enemies, and they were the Jews, and a party that exaggerated about him, and they left the faith. And verily, my community will split into three parties on account of you. One party is your Shí'ah, and they are the believers; one party is your enemy, they are the doubters; and one party are those who exaggerate about you, and they are the deniers. O 'Alí! You are in heaven, and your Shí'ah, and the lovers of your Shí'ah. And your enemy and the exaggerator are in the fire.'"
(Bihàr, 25, 264, 4)
Out of the sects that claim to follow Imam Aly
, those that exaggerate about him, claim he is divine, are wrong, and he has denounced them. They are considered to be disbelievers by the other Shias.
If Allah assists you, there is none that can overcome you; and if He forsakes you, then who is there that can assist you after Him? And on Allah should the believers rely (Qur'an 3:160)