Clever wordsmithing and plagiarism on the part of Zoro followers still can't make it so. Also the Judeo Christian God created ALL which means He also created people who decided to use their freedom foolishly - creating false religions that copy Christianity. It's actually true that Zoroastrianism copied and borrowed from Judaism and Christianity. Alot of "religions", mythology and superstition borrows from the original - the Bible.
The argument that Judaism/Christianity borrowed from Zoroastrianism is, as yet, unproven. In fact, if any borrowing was done, it was quite possibly the other way around (i.e. Zoroastrianism borrowed from Judaism/Christianity).
In the first place, the evidence actually indicates that Zoroaster wasn't even born until about the time of the Babylonian Captivity. Kenneth Boa states that his dates are sometimes given as 628-551 B.C. (Cults, World Religions and the Occult [Illinois: Victor Books, 1990], 45). Other scholars give similar, though not identical, dates (e.g. Herzfeld, 570-500 B.C.; Jackson, 660-583 B.C - see W.S. Lasor, "Zoroastrianism," in Evangelical Dictionary of Theology, ed. Walter Elwell [Michigan: Baker Book House, 1984], 1202). If these dates are even relatively accurate then it is quite possible that Judaism did not borrow from Zoroastrianism. Rather, it may actually have been Zoroaster who borrowed from the religion of the Jewish captives in Babylon.
It is certainly true that Zoroaster spoke of such things as "... the coming of a savior and the resurrection of the body," etc. (Ibid., 44). But he may have borrowed these ideas from the Jewish captives in Babylon. Indeed, it appears that all of these ideas can be found in the Jewish Scriptures PRIOR to the Babylonian Captivity.
For instance, even if we grant the contention of the person who wrote the web article you referred me to, that Isaiah offers the first, full monotheistic conception of God (e.g. Isaiah 43:10-13), it by no means follows that Isaiah borrowed this conception from Zoroastrianism! Indeed, Isaiah wrote his book BEFORE Zoroaster was even born! The period in which Isaiah was writing was roughly that of 740-680 B.C. Thus, if there was any borrowing, it was Zoroaster borrowing from Isaiah--not vice-versa. Besides this, LaSor argues that Zoroaster was not a true monotheist anyway, but a polytheist. At most he was a dualist: "He exalted Ahura Mazda...as supreme among the gods...and viewed the world as an agelong struggle between Ahura Mazda and Angra Mainyu" (Ibid., 1202).
In addition, the coming of a savior is promised as early as Gen. 3:15 in the Bible. This was long before the birth of Zoroaster. Genesis was probably written between 1450-1410 B.C. And there are numerous other Messianic prophecies before the Babylonian Captivity (e.g. in Numbers 24:17 (Law); Psalm 22--especially v. 1, 7-8, 14-18 (writings); Isaiah 52:12-53:12 (Prophets)). All of these prophecies were given BEFORE the birth of Zoroaster and the development of Zoroastrianism. Thus, we need not think that Judaism/Christianity borrowed the idea of a Savior from Zoroastrianism; likely it was just the reverse.
The resurrection of the body seems clearly alluded to in Job 19:25-27. Although this book may have been written during the time of Solomon (approx. 965 B.C.), the events themselves are almost certainly from the patriarchal period (approx. 2000 B.C.). Additionally, Psalm 16:10, written by David long before the Babylonian Captivity also alludes to the physical resurrection of the Messiah (see Acts 2:25-32). Thus, the idea of bodily resurrection (including the resurrection of the Messiah) would seem to predate the advent of Zoroastrianism.
Finally, angels are mentioned in the Bible frequently in Genesis (e.g. 3:24; 19:1; 28:12; etc). Thus, the biblical doctrine of angels is also prior to the beginning of Zoroastrianism.
As for the NT authors adding in Messianic prophecies after the fact, it is simply false. For example, a copy of the text of Isaiah, dating to around the 2nd cent. B.C., was found among the Dead Sea Scrolls. This copy of Isaiah is thus PRIOR to the birth of Christ. The prophecies are genuine. Not only this, they also predate the origin of Zoroastrianism as I mentioned previously.
As for Jesus being either unhistorical or insane, both conjectures are entirely without merit. The first flies in the face of an immense amount of information from both ancient Christian and non-Christian sources that were roughly contemporary to Jesus. For instance, aside from the NT and early Christian writers, there are references to Jesus in the Talmud, Josephus, Tacitus, Pliny the Younger, etc. The second notion, that Jesus was insane, is pure speculation with virtually no evidence whatsoever to support it. People say all sorts of strange things, but the evidence in support of these theories is flimsy in the extreme. And the evidence against such ideas is truly overwhelming.
I hope this sets your mind at rest a little. The ties between Judaism/Christianity and Zoroastrianism are certainly interesting, but the evidence is insufficient to say that the former borrowed from the latter. Indeed, if any borrowing was done, it was likely Zoroastrianism borrowing from Judaism/Christianity.
I see no need to debate this further and encourage you to seek truth. The only place you will find that is in the Bible not through false prophets such as Zoro.