I had a slow journey to where I am now. I examined other religions, and came to the conc. they were all made by men for men (women don't get much of a look in). God has nothing to do with any of them.
I examined the Bible and found it not to be the word of god.
I examined the evidence for the existence of god, and could not find any that convinced me.
Like dear Talesin above, I find that whatever I have the power to do to make life better for my fellow humans is worth doing, and it makes me happy ! so, volunteering, giving blood, etc etc is basically aselfish thing, it is for my personal happiness and feeling of worth.
I enjoy good music, so will attend services etc. for the music and choir on occasion, but I feel it would be silly to pretend to worship a fictional figure.
Compassionate Humanist is my label.