Blaise Pascal 1623-1662
Pascal's Wager is an argument in apologetic philosophy which was devised by the seventeenth-century French philosopher, mathematician, and physicist Blaise Pascal.
It posits that humans all bet with their lives either that God exists or does not exist.
Given the possibility that God actually does exist and assuming the infinite gain or loss associated with belief in God or with unbelief,
a rational person should live as though God exists and seek to believe in God.
If God does not actually exist, such a person will have only a finite loss (some pleasures, luxury, etc.).
http://en.wikipedia.org/wiki/Pascal's_Wager

Sun Myung Moon
The Rock Of Tears:

Sun-myung Moon and Kim Won-pil arrived at the Pusan train station in the dark, and spent the first night squatting beside a fire they made in an empty butter-can left by UN troops1 In the bitter, cold morning, the sun rose revealing the bustling squalor of the wartime city.

Moon began to seek out acquaintances whom he knew to be in the city. He found Kwak No-pil, the school friend whose empty house he had recently used in Seoul, in a small rented room, where he was living with his wife and baby daughter.2 They greeted each other warmly, and sat up all night talking about religion. Moon tried to convince Kwak that God was going to rescue mankind from evil. For Kwak, it was all a bit airy-fairy. A Christian, he was having doubts about his childhood faith. He had been in his first year studying politics at Yonsei University in Seoul when the war broke out, and both his studies and the brutal reality of war led him to question his beliefs.

"God's existence is a philosophical problem for me. I'm not even sure he exists," Kwak said.

"You're asking the wrong question," Moon said. "You should not be thinking does God exist or not. It's too theoretical. Ask instead, why does God exist? What does he exist for? If there's an answer to that question, the question about God's existence answers itself "

"That's easy to say. How does it get round the basic question? Either God exists or he doesn't," Kwak insisted.

"What I mean is, if you figure out why God exists, everything falls into place, including the fact of God's existence. Pondering God's existence by itself misses the point. The question is, does the relationship exist, the relationship between God and man."

Kwak was not convinced. In the morning Moon began to talk of his own future.

"All religions will be united one day," he said. "We have to unite the different faiths." He said he was going to write a book and that his teaching had to be spread throughout the whole world.

http://www.tparents.org/library/unification/books/sm-early/Chap10.htm