Deviated Sects

Q: I am very confused when it comes to sects in Islam (e.g. Shia, Sunni, Wahhabi). I live in UK and I see a lot of sects in Muslims here. Myself I belong from Sunni/Sufi background. I like to call myself just a Muslim and try to avoid sects. However, when I try to improve my knowledge of Deen, I get confused by the different opinions. Most of the opinions make sense to me as the scholars from every sect tend to come up with valid evidence. After looking at a YouTube clip of Dr Zakir Naik I got even more confused. He says that Quran is against sects (giving reference to the Quran chapter 6 verse 159- "Indeed, those who have divided their religion and become sects - you, [O Muhammad], are not [associated] with them in anything. Their affair is only [left] to Allah; then He will inform them about what they used to do.”) Now my question is if the Quran doesn’t allow sects. Does that mean everyone who calls themselves Sunni Shia Wahhabi is not following the Quran? And if that’s true, then what is the best way to educate myself?

Q: Can you please inform me what group exactly is the "khawaarij" and who are they? What are their characteristics? Do they still exist today? What is the definition of khawaarij? And I heard many people saying that the group Isil falls under the khawaarij. Is this true?

Q: I would like to know if all Shias are non-Muslims?

Q: I am a sunni muslim and I recently heard about Burhani's (Dawoodi Bohra). I searched through the internet but was not able to understand that who actually they are. So can you please tell me who they are? Who they belong to? Who they worship? What are their beliefs etc. Jazakallahu khairan.

Q: Are Barelwis Kaafirs?

Q: I have committed zina twice. I repented once after the first time and made the mistake a second time. I'm not sure if my repentance will be accepted by Allah Ta'ala. After I committed the crimes I became a Shia Muslim. Have I taken the wrong path? I really need help.

Q: Please can you enlighten me on shiasim in Islam.

Q: Someone said this: "anyone who says that they believe and ascribe to the fundamental beliefs of the Shia is a kaafir" and also: "Anyone who believes in the fundamental beliefs of the Shias is a kaafir." Is there anything wrong with these statements, are they correct?

Q: My husband became a Qaadri. What is the different between qaadri and sunni? Has he chosen right?

Q: Are barelwis, ahle hadith, jamaat e islaami, salafis part of ahlus sunnah wal jamaah?