They are a coin with single face. They become one as they follow Isac (Hazrat Issaq) on the other hand we are considered the step brothers. Hence Step brother is never accepted and considered the enemy.
You need to understand concept of Parliament and concept of Islamic state. They are opposites.
Please read Magna Carta and history of Medina under the time of our Prophet (PBUH).
You are missing the point here. Democracy never gives unlimited power to one man but gives it to the Parliament.
On the other hand Islam gives all the power to the Khalifa, He becomes the Leader + Qazi (Chief Justice) + Sippah -e- Sallar (Chief of Armed Forces). This is absolute power that MAN...
Can not say who is a true Muslim and who is not but if Mahdi is the chosen one then Allah would change the hearts and minds of those misguided Muslim Brothers. Once this is done then this remains only Muslims and Non Muslims.