I chose messianic Judaism because Torah, the first five books, is the foundation of the entire bible, rather than any church doctrine or tradition; Christianity is the EXPANSION of Judaism, rather than alternative or replacement, as most Christians believe.
Actually, I think I just understood what you might mean by "expansion".
Yes, in Matt. 5 Jesus expanded the moral laws, redefining murder as hatred, for example.
Thus, Christ BOTH fulfilled AND expanded the Torah, thereby superseding it with the Gospel per Heb. 7:11-10:1 (cf. Gal. 3:28).
It is good you realize that being a Judaizer rather than a Christian/Messianic Jew is wrong.