In the name of God, the compassionate and the merciful
Salam all,
May Allah guide us all.
Before starting my arguments and any response to the question, I'm going to make two things clear.
1- Well, it's clear that the mentioned verse(Quran 6:159) forbids any illogical divisions in Islamic society. Saying that "I'm Shia" and " He is Sunni" or "We are Wahhabi" and "They are Hanafi" or...seeking for divisions and superiority is wrong.
2- Let's suppose Mr.x as a Muslim has got the wrong path. Should I hate him just because he doesnt wanna admit my beliefs! Can I make him go to high levels of Paradise by force!!=>The answer is NO. Thus, regarding all the sects, with their differences, one should love all his Muslim brothers. We are all brothers and Muslims with the same God, prophet and book. May Allah help me to achieve it.
My arguments to the issue will be risen up from two different point of view:
a) From an individual Muslim point of view
b) From Muslim society ( whole Islamic Ummah) point of view
From an individual Muslim point of view:
This one starts with a question; what an individual Muslim is likely to lose if he/she is not Shia/Sunni?
The fact that some sects of Islam have some precious practices that the other sects may not have, is undeniable. There are some practices in Shafei sect which are ignored in Hanbali sect. There are some practices in Sunni sects which are ignored in Shia sects. There are some precious beliefs in Imami sect which are ignored in some other sects.
In my idea, an individual Muslim should be aware of all the precious practices and beliefs of all the sects. Here is an example:
Prophet Muhammad(pbuh):
Waiting for Faraj(Mahdi's arrival) is Ibadat(praying).
Prophet Muhammad(pbuh):
The highest degree of Ibadat, is to wait for Mahdi's arrival.(to make your self ready to help him)
Prophet Muhammad(pbuh):
Till Mahdi's arrival, human being will be able to open one door of knowledge by half, when he appears he will open 26 other doors by himself.
Imam as-Sadiq(pbuh), the 6th successor of the 12 promised successors:
His life will be in danger. (In response to a Muslim who asked :" What's the secret of Mahdi's absence?)
Mahdi (pbuh):
Pray for my arrival and ask God to hasten it.
Here is one of the precious thing that Sunni brothers miss:
They dont know who Mahdi(pbuh) is. How he will appear. How can they help him. How they can save his life. What exactly the signs of his arrival is. and....
I'm well aware that there are some precious practices in other sects which I need to know.
From Muslim society ( whole Islamic Ummah) point of view:
How can one ignore the importance of a true leadership system?
Classical Sunni leadership belief:
Any Muslim king must be followed unless he has a serious problem with pillars of Islam (Is drinking wine OK?!!)
Isnt it a defect?!
I'm well aware that there may be also some defects in my sect.
To sum up briefly:
Let's share all good and precious things of our sects. No matter what we call ourselves.