Our Lord said, "No man can serve two masters. For either he will hate the one, and love the other: or he will sustain the one, and despise the other. You cannot serve God and mammon." (Matthew 6:24)
And He also said, "Every kingdom divided against itself shall be made desolate: and every city or house divided against itself shall not stand." (Matthew 12:25)
Thus, one who was born a Jew and wants to convert to Christianity, must make the decision which master/house he will serve, and plant both of his feet there. instead of planting each foot in a different house, under a different master.
However, if this logic is not enough for you, I wrote an article a year and a half ago, using more Scripture to prove this case:
https://thecatholicstate.com/what-the-catholic-church-teaches-about-the-jews-part-9/
I also recently made a video using even more sources and logic to prove this case. Please choose whatever streaming service you wish to watch this video:
Rumble:
https://rumble.com/v4uo40z-what-does-a-good-jewish-convert-to-catholicism-look-like.html
Bitchute:
https://www.bitchute.com/video/7tdeyCz5yalw/
Odysee:
https://odysee.com/@ChristTheKing:9/what-does-a-good-jewish-convert-to:b
SpiritusTV:
There was no slow evolution of Judaism. This is Biblical. I write about this all the time and say it in many of my videos. But since you probably don't follow me, I will repeat it:
In the Gospel accounts, the Jews call for the Deicide of Jesus Christ. They threaten Pontius Pilate with revolt if he wouldn't comply. In Matthew 27:25 they literally curse themselves as well. Christians from the beginning of the Faith have always understood this to be a rupture between Israel and Jewry. The Jews that accepted Christ became the first Christians, or a continuation of Israel. The Jews that rejected Christ - the majority - became the Synagogue of Satan, and continue to be so as long as they reject Him. This is all over the New Testament.