Jim Irwin who was one of only eight people to walk on the moon (at least at the time of writing). He went to space agnostic, but returned a passionate Christian, leaving NASA to start his own Christian mission. He stated:
The entire space achievement is put into proper perspective when one realises that God walking on the earth is more important than man walking on the moon. I believe that God walked on the earth 2,000 years ago in the person of Jesus Christ.
From the book "Amazed by Jesus"