Autodidact
Intentionally Blank
Actually , the division between shias and sunnis is not upon interpretation of Quran rather its due to historical facts, but the main reason is shias contradiciting the principles of Islam, wich makes the difference intolerable. Because the difference of opinions is a very well know thing in Islam upon secondary rulings, not upon principles. So when principles are contradicted, then the difference is not tolerable anymore, and those who contradict it (their scholars) are considered as out of the fold of Islam, while the laypeople are excused for ignorance.
This is the sort of intolerant attitude, stating as fact issues that are widely questioned, that turns me off of Islam. There's a fundamental arrogance that is just intolerable.