I'll do my best to address the errors themselves since I didn't do that yet.
1) Myth: Tobit endorses the use of magic
Of course not. This is a subject of miracles, not magic. We don't conclude in Exodus 12:4-7 that rubbing lamb's blood on doorways to keep death out is magic, but a subject of miracles.
2) Myth:
Teaches that forgiveness of sins is by human effort.
Forgiveness of sins is by Grace alone, and one needs Faith to obtain grace, but faith without Works is dead (James 2:24). Tobit 12:9 is in accordance with one's works due to his faith. It's not suggesting works of one's own self and devoid of faith. Revelation 22:12 says "Behold, I am coming quickly, and My reward is with Me, to render to every man according to what he has done."
3) Myths about Historical Errors.
Here's what I found from the
Jewish Virtue Library on the Chaldeans...
Judith might have considered Babylon part or no different the Assyrian empire, since Babylon was part of the Assyrian empire. Beyond that, Judith could have meant the northern kingdom of Israel were Assyrians, since the Assyrian empire had first defeated it and thus changed at least part of its culture. Another thing to consider would be the Roman empire -- after the fall of the western part of it the eastern part lived on, and they called themselves Roman, and whatever they called the Roman Empire, was still the same. It was future historians that changed the naming.
The links in reading are interesting, but they are 1) going by their own fallible interpretation and 2) dismissing scripture that isn't part of the deuterocanon. It's a case of cherry-picking in order to push an agenda rather than being truthful.
I do agree that if there are truly errors, then it can't be God's Word as God's Word is without error. Exodus 20:4-5 says not to carve idols, but one might find error with Exodus 2:15 or Numbers 21:8-9 as each involve God commanding His people to make cherubim out of beaten Gold and when Moses made the bronze serpent that whomever was to look at it would live.
This is why Bible study must be done very carefully. One could easily find contradictions, but the Holy Spirit isn't one to contradict or confuse.
