Are you Shia or Sunni?

Salaam alykum,

I am a Muslim who says لا إله إلا الله محمد رسول الله.

I hope that, insha Allah, you judge me based upon the substance of my opinions rather than what labels people may associate with me.

If Imam Jaafar, Imam Abu Hanifa, and Imam Malik all worked together, then what does that say about us Muslims, when we refuse to do so between each other?