I am a secular Humanist, and I believe in an afterlife only to the extent that my molecules will one day form parts of the sky or earth after I've gone.
I was raised as an Anglican Christian but I worked out when I was first really ill that I really didn't believe because I felt no need to pray when I was waiting for the results of the scans to see whether it had metastasized. I like the morals though, and a framework that encourages people to be nice to each other and live responsibly, which is why I became Humanist.