The Torah plainly says G-d might give prophets the power to trick the Israelites:
If there will arise among you a prophet, or a dreamer of a dream, and he gives you a sign or a wonder, and the sign or the wonder of which he spoke to you happens, [and he] says, “Let us go after other gods which you have not known, and let us worship them,” you shall not heed the words of that prophet, or that dreamer of a dream; for the L-rd, your G-d, is testing you, to know whether you really love the L-rd, your G-d, with all your heart and with all your soul. (Deuteronomy 13)
“Hey you guys, I might test you with a miracle-worker who lies to you! Here’s how to pass the test”:
And that prophet, or that dreamer of a dream shall be put to death; because he spoke falsehood about the L-rd, your G-d Who brought you out of the land of Egypt, and Who redeemed you from the house of bondage, to lead you astray from the way in which the L-rd, your G-d, commanded you to go; so shall you clear away the evil from your midst. Very Important Chapter
G-d might give a prophet miraculous powers to LIE about Him. He might place EVIL in their midst. That’s exactly what it says. No limit on miraculous powers is listed (“Not to include rising from the dead. Not available in Alaska and New Jersey.”) HaShem ain’t George Burns writ large.
A miracle, by itself, however jaw-dropping, proves nothing about G-d’s endorsement. This is the issue:
Did the Israelites believe G-d had a son help Him create the universe? The only reference to the son of G-d in the Torah is Exodus 4:22.
Did they believe the Torah was anything other than “everlasting,” “for all generations,” and “eternal”? Over and over and over and over it says do not add, subtract, or deviate by one iota. No expiration date is given.
And [Passover] shall be for you as a memorial, and you shall celebrate it as a festival for the L-rd; THROUGHOUT your generations, you shall celebrate it as an EVERLASTING STATUTE. (Exodus 12:14)
Thus shall the children of Israel observe the Sabbath, to make the Sabbath THROUGHOUT their generations as an EVERLASTING COVENANT. Between Me and the children of Israel, it is FOREVER a sign that [in] six days The L-rd created the heaven and the earth, and on the seventh day He ceased and rested.” (Exodus 31:16-17) It’s on Saturday, BTW.
[This is] an ETERNAL STATUTE for ALL your generations, in all your dwelling places: You shall not eat any blood or fat. (Lev. 3:17)
[Yom Kippur] is a Sabbath of rest for you, and you shall afflict yourselves. It is an ETERNAL STATUTE. (Lev. 16:31)
What else does G-d need to do to establish that these are unchanging? Clash cymbals? Fill out a permission slip in triplicate and send copies? If this doesn’t mean “true forever,” WHAT DOES?