Its not that complicated. The thing that does the greates good for the largest number of people in a peacfull way is all you need.
I think the issue may be "complicated" by the fact that only 33% of the world's population is Christian.
How can you form a religion with the goal of "the thing that does the greatest good" around a set of beliefs only a minority of people buy into whatsoever? How is your true religion (or spirituality) going to help Muslims, Hindus, atheists, etc?
-inkling