It's no problem. If you're a fan of science & spirituality, you should read Fred Alan Wolf. He is a physicist who also has thoroughly studied eastern mysticism. He finds ways to connect quantum theory to commonly held spiritual beliefs... It's quite enlightening! And there's this one book, called 'The Visionary Window: A Quantum Physicist's Guide to Enlightenment' that I think you'd like a lot. I never read the whole thing, but it holds the argument that science & spirituality CAN exist together, without contradiction. They don't have to exist as the same thing, but they can live alongside one another.

IDK. I kind of don't view it as "reward or punishment" either... It's hard to explain. Especially when karma is viewed as some kind of ethereal scoreboard by most people, it's difficult to explain it without contrasting it with its preconceived idea. I guess maybe I might NOT believe in karma, really... However, when I start to feel unsettled or that a certain 'something' is amiss, I reevaluate myself to see if I've looked over something. If I'm happy, I must've done something right. If I'm not, then I missed something. I SENSE an imbalance. But it's nature varies from circumstance to circumstance.
I really only do stuff for people so I am not in a state of owing them... Lol. I don't like people having leverage over me. So I don't think that has a damn thing to do with karma. XD