Christi,
I cannot really say how it is for you or anyone else. I can only write of my own experience and my knowing of Truth, whatever it's worth to you or anyone else. I do not wish to debate or argue over this thing. I share whatever comes because my fingers tap on the computor. Your posts trigger a wish to respond, that's why I reply. I'm sorry if I write something you don't agree with or don't like. I don't want to persuade you - you have your own beautiful truth, and we all will find the truth inside of us.
However...
Interesting to read your question "So the question for me is... where is the door? Where is the door that leads us from one perception, the perception of separation, to the perception of oneness?" It was a question I picked up during the day, so I was a bit surprised to read it in your post, and what arose was: practices. Practices are like the ring signal and the phone call in Matrix - the door out. The mysterious link between the worlds.
The conclusion of the consequence 'let go of all responsibilities because existence is not real' is not logical in my experience. (Note: existence exists but is not REAL, just as the movie exists - everybody can talk about it, but it's not REAL.). When it hit me that existence is not real (and I mean REALLY hit me - resulting in a gigantic laughter), the outpouring love and stillness in action 'took over' and was living life so extremely intelligent without "me doing" anything. The "little me" was not there anylonger to carry any responsibilities, yet everything was perfect. It was just so difficult to take anything seriously anylonger. A bubbling laughter from the deep was there all the time. And a strong compassion and love for everything in existence. Everything - not only the "good stuff" we'd like to enjoy, but also all the "bad stuff". Good and bad lost its meaning totally.
I still wobble between the worlds (Bernie sighed and said 'you live in two realities, get REAL!'), so this hits me over and over again, but I'm still not steady in any state and do not know how "deep or far" I have come (if that is even possible to measure). I just know that what happens in those flips is that life, consciousness, supreme intelligence is unfolding life for me. I watch. That's the freedom. The beauty. The unfathomable grace of living. And I'm not the doer of anything but only has to make the effort to stay awake. That doesn't come automatically.
"If everything is One, and God is omnipresent, then everything is God, whether it is inside myself or outside myself."
Yes, very true to me. Both the movie and the screen is God. But only one of them is real. It's the both of them that creates a whole, but it's a great difference in realness.
"For that, I believe, we have to accept every aspect of the creation as an expression of the Divine Self, and as a mirror of our Self. That is why Bernie asked you on the retreat to go around thanking each other for being such perfect mirrors. He didn't say "ignore everyone else on the retreat EMC, they don't exist, only you are here, only you are real"."
Yes to the first part. And I would dearly stress the "mirror" part of it. "We are the mirror as well as the face in it" says Rumi - not mentioning the "real person" who owned the face. Plato says its "puppets" creating the shadows, not much real in that either. Barry says it's only "ideas in consciousness" that are being manifested in existence." It's a great show of nothing appearing as something, but actually it's empty! Emptiness dancing, as Adyashanti says. Stillness in action, as Yogani says. Not much substance in any of it.
And just to get things right - Bernie did not TELL us to do anything. It was words that fell naturally from our mouths. He said "What you believe are persons here in this room are totally fake! I'm totally fake. Dismiss Bernie Prior. I am nobody - this body is actually nothing - you are nobody. Only THIS is, only THIS is real".
I truly respect your choice of words when you say existence is real and I think your view of it all is wonderful. I just can't say the same and truly mean it.