A well known Christian evangelist entering a Muslim country had this conversation with the customs official.
“For what purpose are you entering my country? “I am a Christian evangelist and have been invited by here by your government for a debate at one of your universities.” “Tell me sir. What do you think of Mohammed?” “May I ask you a question?” “Yes.” “Can a prophet lie?” The man thought for a moment and said, “No. A prophet cannot lie.” “Mohammed was a prophet?” “Yes.” Mohammed said Jesus was a prophet?” “Yes.” “Jesus said He was God. If Jesus was right than Mohammed was wrong. And if Jesus was wrong, Mohammed was still wrong because Mohammed said Jesus was right!” The man stamped his passport and said, “Get out of here!”