Well, this doesn’t constitute
proof of any trinity per se but I post merely to show a possible Catholic view of one key verse in
Genesis followed by a Jewish view.
Go to
VeritasBible.com on the side of CAF’s title page and type in
Genesis 1:26 (the verse mentioned by ziapueblo upthread

) and you will read of God creating man: 26 And he said: Let us make man to our image and likeness: and let him have dominion over the fishes of the sea, and the fowls of the air, and the beasts, and the whole earth, and every creeping creature that moveth upon the earth…
Note the “us” and “our” upon which Catholic Haydock comments: “
God speaketh here in the plural number, to insinuate the plurality of persons in the Deity. Some of the ancient Jews maintained that God here addressed his council, the Angels; but is it probable that he should communicate to them the title of Creator, and a perfect similitude with himself?”
The Jewish response and interpretation of the exact same verse in Genesis can be seen in the prominent Rabbi of the Middle Ages, Rashi’s commentary:
"*Let us make man: From here we learn the humility of the Holy One, blessed be He. Since man was created in the likeness of the angels, and they would envy him, He consulted them. And when He judges kings, He consults with His Heavenly household, for so we find regarding Ahab, that Micah said to him, (I Kings 22:19): “I saw the Lord seated on His throne, and all the host of heaven were standing by Him, on His right and on His left.” Now do “left” or “right” apply to Him ?! But rather, [the passage means that] these [angels] were standing on the right to defend, and these [angels] were standing on the left to prosecute. Likewise, (Dan. 4:14): “By the decree of the destructive angels is the matter, and by the word of the holy ones is the edict.” Here too, He took counsel with His heavenly household. He said to them, “Among the heavenly beings, there are some in My likeness. If there are none in My likeness among the earthly beings, there will be envy among the creatures of the Creation. ” - [from Tanchuma, Shemoth 18; Gen. Rabbah 8:11, 14:13]
Let us make man: Even though they [the angels] did not assist Him in His creation, and there is an opportunity for the heretics to rebel (to misconstrue the plural as a basis for their heresies), Scripture did not hesitate to teach proper conduct and the trait of humility, that a great person should consult with and receive permission from a smaller one. Had it been written: “I shall make man,” we would not have learned that He was speaking with His tribunal, but to Himself. And the refutation to the heretics is written alongside it
“And God created (וַיִּבְרָא) ,” and it does not say,“and they created וַיִּבְרְאוּ.” - [from Gen. Rabbah 8:9]"
There you go, two different interpretations, with Rashi specifically addressing the Christian approach, and Haydock the Jewish.*