Dr. Nasr Farid Wasil, Former Grand Imam of Egypt:
Every Muslim has a right to worship God according to the school of Imam Ja'afar Sadiq as well as the four Sunni branches.  The differences that some use as an excuse to attack Shia are not deep. The differences among Shia and Sunni branches and others are normal differences just like those between Hanafi and Hanbali schools.
The multiplicity of religions from the point of view of jurists and thinkers, p.151