What scripture or scriptures tell you the antichrist "has to be a Jew and his religion Judaism"?
A little background. God was the king of Israel until Israel wanted a man-king like the other nations instead. It was a big time sin.
1samuel10:
18 And said unto the children of Israel, Thus saith the Lord God of Israel, I brought up Israel out of Egypt, and delivered you out of the hand of the Egyptians, and out of the hand of all kingdoms, and of them that oppressed you:
19
And ye have this day rejected your God, who himself saved you out of all your adversities and your tribulations; and ye have said unto him, Nay, but set a king over us. Now therefore present yourselves before the Lord by your tribes, and by your thousands.
1Samuel 12:12 And when ye saw that Nahash the king of the children of Ammon came against you, ye said unto me, Nay; but a king shall reign over us:
when the Lord your God was your king.
God is the rightful king of Israel and what made them a called and chosen people unlike the other nations. But they rejected God as their king, so God gave them Saul. After Saul sinned, God took the kingdom from him, and gave it to David, a man after God's own heart - as a forerunner to the messiah who would be God's plan to redeem the world.
The Lord of heaven entered this world as Jesus, the living temple of God, to take his place as the king of Israel - and to keep God's promise to David that he would always have a descendant on the throne of Israel.
Keep in mind that Jesus the true and rightful messiah, God as King of Israel, was also a Jew - because of that promise to David. The Antichrist thus has to be a Jew as well, to be perceived as the person in the Jews eyes as fulfilling that promise God made to David.
John 5:43 I am come in my Father's name [as their king],
and ye receive me not: if another shall come in his own name, him ye will receive [as their king].
1. In John 5:43, Jesus said that the Jews would embrace another coming in his own name - inferring that they would embrace someone else as their king, in terms of "the" promised messiah. Technically, messiah is a transliterated word for anointed - in biblical terms of the old testament, anointeds referred to the kings and priests. "The" messiah though is reference to one specific King of Israel to lead them and the world into the time of redemption, peace and harmony in the world, based upon Isaiah 11.
2. The early Christians were already aware of the "someone else than Jesus" person which was the term Antichrist - as John said in 1John2:18 that they had already heard that Antichrist shall come. Specifically, who first used the term is not known.
In 1John2:18, "as ye have heard" implies that they already were aware that antichrist was coming, but it doesn't say how they had become aware that antichrist was coming. 18 Little children, it is the last time: and
as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time.
3. Back in Deuteronomy 17:15 , God knowing that Israel would eventually reject him as king, told them never to have a king over them that wasn't one of themselves - that is an Israelite. So any of their kings has to be of the 12 tribes.
4. Regarding "the" messiah, he has to be descended from David. And thus is often referred to as the Son of David. The actual text says from Jesse, David's father, in Isaiah 11. The Jews (Judaism) also believe that Isaiah 11 is talking about the messiah. So in order to appear to them to be the messiah, the person who becomes the Antichrist, King of Israel, must be a Jew.
5. The Jews are not going to embrace anyone as their messiah - King of Israel - unless his religion is Judaism because the messiah to them, is supposed to them teach how to rightfully observe the Torah, guide for living. Being observant to Torah is the essence of Judaism. Unfortunately, Kabballah is also part of Judaism, and that is how the person is going to get his power, not his own.