Brian McLaren is an author, speaker and activist, well known as one of the thought leaders of the "emerging church" movement. His books have given words to what many people have felt about church, Christianity and Christ-following. I know him personally, and know him to be humble, wise and holy (in the sense that his life is wholly devoted to God).
Brian has recently announced that as of today, he will be observing a month of fasting, joining Muslims around the world as they observe Ramadan. He has not done this is align himself with Islam (obviously), but rather as a way of observing a Biblical command (to fast) and a Christ-like reaching out to others of different faiths. Christ's approach to those of other religions was not confrontation, but rather engagement. It did not involved doing anything opposed to His own faith, but did involve stepping into the world of the "other".
I admire Brian for his desire to build these types of bridges, so that in every possible way he will find a path to bring the light of "Issa al Massi" (Jesus the Messiah, as referenced in Arabic and in the Koran) to Muslims. I see this as being in the Spirit of both Paul and Jesus.
Yet, as you can well imagine, he is opposed in this quest, and his detractors have used to opportunity to (literally) call him apostate and a son of Satan.
Brian's reply is unbelievably gracious and Christ-like. Read it here, and be encouraged that there is a new kind of Christian emerging in the world.