OP,
Your posts are very interesting and worth contemplating but when you start siding with the SDA, red flags go up in my mind to be cautious with your views.
The SDA is very cult like, I have close relatives that left after thirty some years and say it is most definitely a cult. It hasn't diminished their faith in Jesus Christ but they would never go back.
I don't post links on here anymore, but if you would just Internet search - SDA one eyed symbolism- you will find numerous examples of SDA magazines with the one eyed symbolism on their cover. That is showing allegiance to the beast kingdom, not God's Kingdom. Zechariah 11: 13-17.
I don't think it matters at all to Christ if you worship on Saturday or Sunday or everyday within your heart.