I love this topic :) Everything, all-that-is, is another name for God if you're a pantheist, but I don't often use God language in my own path. However, contemplating everything is a useful koan or 'divine' spiritual mystery due to the inherent self-reference paradox, the contemplator and contemplated merge into one, propelling me out of thoughts about everything, to awareness of everything as my essential being.
I also believe that everything is equivalent to that other mystical notion of emptiness/nothingness/void. It seems that both everything and nothing are beyond our powers to imagine from within the mindset of self/other and are pointing to an undivided whole.
What if the hokey cokey really is what it's all about?