I am a Noachide, who came out of so-called "Messianic Judaism" after about 20 years. During those years, I believed I was part of Israel and the mitzvot were incumbent on me. I gave up jobs, sought a wife of like mind, and began to raise my children that way.
Now, I "understand" that's not true. But it is hard to tell myself that since I conducted myself as if obligated (though incorrectly) that HaShem wouldn't somehow treat it as such. I wanted to be obligated and I obeyed even when it cost me. Does that confer some obligation?