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Meh, I don't mind the "G" word. As someone who believes in a divinity, I use "god" because most people understand it.
If I tried to explain what I believe in is more akin to the Tao, Adi-Buddha, or Brahman, I might end up losing people in the conversation (which has happened before).
I don't know about others, but to me rebirth/reincarnation is something philosophically interesting to ponder about; but ultimately we can't know for sure if it's true (if at all).
My advice? By all means stimulate your brain and mind with ideas and philosophies of what could be true, but remember that your life now (the one that you know you're living in) is more important. Better to make good use of your time on what you know you can do, rather than on what may or may not be real.