For you, and many others, I'm sure it is, but for myself, and many others, it isn't.
It is for everyone. You have nothing to back up your beliefs, while I, as a Christian, have the revealed Word of God that has existed in written form for nearly 2000 years. You claim to serve an omnipotent god, and yet claim that he has given mankind no way of knowing exactly how to serve him. The god you serve is not the God that I serve.