Mostly, the answer to most of your questions is I don't know.
I love the Lord and I know all His ways are perfect and I study them constantly and talk about what I learn. But the bottom line, the core of everything, is taking out sins to Christ. My studies lead me to believe that God never wanted His children to disregard the feasts. Most true Christians, ones who accept all God tells them to the best of their ability, believe I am wrong. I am certain, to the best of my understanding, that our salvation does not hinge on believing God's way, whether that way is to honor the feasts or to think that the new covenant made the feasts obsolete. Yet it is important to me to search for the truth of this. We can be wrong in something and be saved. I am sure there are saved people whose beliefs are on either side of this issue. Same for being a Catholic or Protestant.
Again, the bottom line is becoming a child of God through Christ. That is a teaching of the Catholic church as well as the Protestant.