"You can’t say that religious opinions made over 1, 000 years ago are valid for all times," says Gamal al-Banna, a reformist Muslim cleric in Egypt. "We must have a revolution in the understanding of Islam, a revolution almost like Martin Luther’s."

Read comments and analysis by religious leaders, scholars, and others on President Barack Obama's speech to the Muslim world.

One thing Rep. David Price (D-NC) expects to hear in Obama's June 4 address is "a sense of humility that also has a religious undertone, that we recognize that we're fallible and that national causes are not to be identified in any unequivocal way with God's will."