There are some points in your post I agree with. I believe also that the Roman Catholic Church is a false church and I also see countless so-called Protestant churches joining up with the RCC without a care in the world other than a desire to unify with this false church in order to bring what they consider to be the greatest revival of all time, with great power in "signs and wonders".
I also agree that to change the Seventh Day Sabbath to Sunday is something the scriptures absolutely give no warrant to do.
But unlike you, I believe Jesus fulfilled the Sabbath and in Him we find eternal rest. I'm sure you've heard this scripture many times as you've debated this issue with others but it's the simplicity of what I believe on this subject:
16 So let no one judge you in food or in drink, or regarding a festival or a new moon or sabbaths, 17 which are a shadow of things to come, but the substance is of Christ.
And so for that reason, I don't let anyone judge me on those issues. But try if you must. :)