Thanks for saying 'some' Christians. 

There is no scientific proof of God.   What is measurable are behaviors motivated by faith.    I've seen happy loving people my entire life and most were strengthened by their faith.   I'm a fan of N.V. Peale and the power of positive thinking.  I've known what being in 'the zone ' means when everything falls into place.    

I liked the RG artical on the roll of faith in volunteerism.   I do not need a physical God to appreciate the value of love and compassion that I've receivered throughout my life.   I happened to put that in a Christian context, and image of the human Jesus that was taught to me as a child.   It works for me