What you are missing, and I think this may be the source of your confusion is this:
1)There is only ONE G-D.
2) G-D is all that exists. There is nothing else.
Here’s a story:
A student asked Rabbi, “What happens when we are born?” Rabbi replied, “The ocean becomes a drop.” Then the student asked, “So then, what happens when we die?” Rabbi replied again, “The drop returns to the ocean.”