Religious people must listen to one another and speak to each other as brothers and sisters, the pope said. "Listen and speak softly, peacefully, seeking the path together."

In "Believer with Reza Aslan," a scholar presents a part as indicative of the whole.

Despite this surge of goodwill, questions remain about whether these new connections can endure.

The invitation came amid increasingly closer relations between the Vatican and al-Azhar University, which is considered the most authoritative theological-academic institution of Sunni Islam.

Louis Theroux's curiosity, open-mindedness and consternation is exactly why his films are successful; he will never run out of questions.

"His attempts to gain access to the church even led Scientologists to set their own cameramen on Theroux, taunting him that they were making a documentary, too."