Your version of Christianity is off. The Sabbath is definitely Saturday. That's a historical fact. However, Jesus said the Sabbath was made for man, not man for the Sabbath.

Easter definitely comes from Ishtar, and choosing Easter Sunday is a pagan ritual. My family and I don't celebrate Easter. We celebrate Passover, which is prophetic of Jesus' death. However, if a fellow believer chooses to celebrate Jesus' death and resurrection on Easter Sunday, I'm not going to fault them for that. Paul was clear in Col. 2:16 - "Therefore let no one judge you by what you eat or drink, or with regard to a feast, a New Moon, or a Sabbath. These are a shadow of the things to come, but the body that casts it belongs to Christ."

Gentiles were grafted into the tree through Jesus Christ. Romans 11: 17-18 - “And you, although a wild olive shoot, were grafted in among the others and now share in the nourishing root of the olive tree… remember it is not you who support the root, but the root that supports you.” (11:17-18). It is important to note though that that root is not Israel. It's Jesus. He is the Vine, and His Father is the Vinedresser (John 15). Those who teach replacement theology are wrong, in my opinion.

But ANY who reject Jesus as Messiah will have God turn their back on them, Jewish or not. Just because you're Hebrew doesn't get you into the tree.

When I went to Mexico, the locals couldn't say my name. Their tongue couldn't wrap itself around its pronunciation. So they used the Spanish version of my middle name. No one in Canada called me by either my english middle name, or my spanish middle name. But in Mexico, my spanish middle name did just fine.

Yehoshua is Hebrew for salvation. Jesus is Greek for salvation. "Hay-zoos" (Je-sus) is Spanish for salvation. Do you think God cares what language we speak in when we say "Salvation!" Every tribe and every tongue will be gathered around the throne of heaven. On the day of Pentecost, as people spoke in multiple tongues, do you think every time they spoke "salvation", they interrupted their proclamation to interject "Yehoshua"? Brother, it doesn't matter. God has many names too, and different tongues have different names for Him. Demons still tremble and scream at the name of Jesus!

As far as the verse, I proved my point. If you can't accept the fact that I believe Isaiah was "a Christian", then that's ok, but I can't say anymore. "Abraham saw My day, and it was counted to him as righteousness." Those are the words of Yehoshua. So you need to take your narrow view of Christian up with your Saviour, not with me.

John 10:16 - "And other sheep I have which are not of this fold (Israel); them also I must bring, and they will hear My voice; and there will be one flock and one shepherd."

All religions are false Christianity, Judisum, Islam, Hinduism, etc .... The Bible never stated to follow a religion. All religions are branches of Rome and the Catholic Church.