[ladyL]

Most of the Christians today who have been called by the Holy Spirit to Renew their covenant with Yahweh are of Abraham's seed. “If you are in Christ Jesus, ye are of Abraham's seed.” Gal.3:29 However, as I explained in another post, the Torah made a way for any foreigner to become an Israelite. They had to meet 3 conditions. 1. Be circumcised (A Believer's heart is circumcised) 2. They must celebrate the Passover, (Yahshua is our Passover lamb)
3. They must walk with the Israelites.

Now walking with the Israelites is where the second part of your question comes in. I could write pages on this but will just give you a couple of high points. Yahshua says, “if you love me you will keep my commandments.” The New Covenant is where Yahweh writes His LAW ON OUR HEART.

The church has taught us we are not under the law but under Grace. This is a very destructive Roman, man made doctrine.

Yahshua said not only are we to obey the Ten Commandments but if we even THINK! in our hearts an adulterous thought we have committed adultery. Now try to reconcile that with the church's teaching that we are not under the Law. Top that off with “Many will come in that day and say LORD,LORD but I will say depart from me ye BREAKERS OF THE COMMANDMENTS” actually it is workers of iniquity but I put in the translation.

Now I believe most Christians keep the Commandments, although they can't explain why since they think they are not under the law. They keep all the Commandments except for the 4th one concerning keeping the Sabbath day holy.
In 325 AD Constantine and the ROMAN CATHOLIC CHURCH changed the 7th day Sabbath to the 1st day to keep the pagan worshipers of Mithras the Sun god happy. Thousands upon thousands of Believers are now keeping Friday sundown to Saturday sundown as the Sabbath. There are many blessings that come with this but the most important is to fulfill Yahshua’s directive when He said,”If you love me you will keep my Commandments.”

[Cronos]

Most of the Christians today who have been called by the Holy Spirit to Renew their covenant with Yahweh are of Abraham's seed

If by that you mean Abraham's SPIRITUAL descendents, i'll agree. If you mean GENETIC descendents, I will disagree -- there are many holy people of European, African, Korean, MesoAmerican birth who have no Israelites blood who are holy Christians

[Cronos]

In 325 AD Constantine and the ROMAN CATHOLIC CHURCH changed the 7th day Sabbath to the 1st day to keep the pagan worshipers of Mithras the Sun god happy.

Nope, that's another error -- the worshippers of Mithra were Zoroastrians, or rather a sect of Zoroastrianism that was in competition with Christianity. Nothing was made to appease them as they were in direct conflict with Christianity.

Secondly, your pejorative against Constantine tends to forget that Constantine was God's tool, just like David or Solomon or Cyrus