Omnipresent

I struggle with the idea of Krishna being all things.  To me at least, Krishna describes himself very much like how I have always thought of God, an omnipresent, all powerful being who’s very nature we will never be able to understand.  I have gained what I think is a sufficient, although not perfect, answer to why God created evil.  However, I am trying to figure out how Krishna could possibly be evil itself.  He describes himself as a demon at one point in the chapter, but how could he simultaneously be good and evil?  Maybe I am only taking into account my Christian ideology where evil is the absence of God, the ultimate form of good, and so by that definition it is impossible for good and evil to coincide in God.  I thought that to be inhabited by both sides of morality was what defined human beings, not gods.  I am curious is maybe Hinduism has a different definition of good and evil than other religions, or maybe just a different definition of the source of both that would allow Krishna to be both.  Krishna’s last words to Arjuna in chapter 11 are my favorite so far, “But what use is it to you to know all this, Arjuna?”  I literally laughed out loud at that question because it made me compare my own desperate endeavors to figure out just what the nature of God is and how it pertains to me.  Krishna’s encouragement after the question, to just remember the simplicity that he supports everything,  was still cool to me even though I don’t fully understand it because I do believe God is that powerful, and it’s awe-inspiring to think of him in that way.