I don't know this seems to be a challenging question for me.
I like challenges.
Do you believe in God (or a supreme being higher than yourself)?
Yes. I believe in god. (To use the word for convenience; but, I don't worship and god is about worship [however defined]) God is not higher than myself. There is no hierarchy.
If you don't, then how come?
I don't believe in an hierarchy and entity god because, to me, that sounds fiction. Regardless if god is anthropomorphize or not, the concept of a figurative or literal god actually "creating" something doesn't make sense. That's like saying nothing created something; and, to make it more confusing, making that nothing a person that "can't be defined or is a mystery". Multiple gods or deities are in the same boat. The point of one wanting, needing, or benefiting from one's worship is beyond how I think of god in regards to our relations with our environment and humanity.
What is it that you believe as far as this is concerned?
I believe god is life and every characteristic from polytheism to monotheism
we see them as, comes from us within our mind. How we relate to life (or to me within life) and interact with people and our environment.
If you do, then how come?
After filtering the characteristics of different gods (not just Abrahamic, Buddhist for example), I realized a pattern. Everything about gods are always a reflection of something a human has, wants, or needs. God/s are external (or the internal looked at externally) objects, people, or places that people worship because it mirrors the reflection of themselves regardless of how they interpret it our see it. We are not aliens to each other; no one is the center of the universe.
What do you call him? IS God a "him" or a "her"?
Sometimes I put a her to life since life creates on a secondly basis. After awhile, it becomes more convenience rather than assigning a gender to life. I
rather just live within life without needing the labels. Perfect Zen. That's my goal.
And how many are there according to your belief?
There is only one god/life. I revere many spirits of our environment, ancestors, and just spirits (or souls of the deceased and environment) in general. So there are millions. I don't call them gods because the supernatural is natural; so all is a part of life or a part of god.
The best we can do is learn how to live
with our environment and
with the people we are around, love, and are friends with. Using the word "with" takes away the word god and just leaves it at giving gratitude as a practice/religion and finding our morals and ways to live as our "beliefs".