Does someone know of a Hindu text or folktale that elaborates upon Karma?

If you believe in karma does that make you spiritual or religious?

I believe in karma, so I do not do bad things no matter whether I will get caught or not. No lying, no cheating, no gossiping, etc... I even feel if I have terrible thoughts about someone else I will be paid back in some way by the karma that will come back to me.

Does that make me spiritual?

I don't know.

Because karma to me is the energy exchange we have with our environment and all that reside in it, I think of it as more scientific than spiritual. But it can't be verified so that takes the proof out of the equation.

Do you believe in karma?