"Christian" is a term that was invented by non-Christians, and later accepted by Christians::
… So it was that for a whole year they assembled with the church and taught a great many people. And the disciples were first called Christians in Antioch.
— Acts 11:26
The early Christians referred to themselves as "the Church of God":
… has made you overseers, to shepherd the church of God which He purchased with His own blood.
— Acts 20:28
Give no offense, either to the Jews or to the Greeks or to the church of God,
— 1 Corinthians 10:32
For I am the least of the apostles, who am not worthy to be called an apostle, because I persecuted the church of God.
— 1 Corinthians 15:9
For the last 2000 years, Christians have considered themselves the bearers of the one true religion, a religion that includes additional revealed knowledge that expands on Judaism.
Before that, Jews considered themselves bearers of the one true religion, a religion that includes revealed knowledge in addition to what was known before Moses.
Before that, the ancestors of Judah (the first Jew) believed themselves bearers of the one true religion, a religion that includes revealed knowledge in addition to what Noah preserved on the ark.
Before that, some people believed themselves bearers of the one true religion, a religion that includes revealed knowledge in addition to what Adam and Eve knew.
Before that, Adam and Eve believed themselves bearers of the one true religion, based on revealed knowledge from God.
The Church of God is a continuous line, with each generation receiving additional knowledge about the one true religion.
They are all the same one true religion, with more knowledge being made available as time goes by.
The connection is even stronger for the many denominations that believe that the GOD (YHWH) of the Hebrew scriptures was actually the same being that was later incarnated as Jesus.
So it really doesn't matter what it is called, Adam and Eve were followers of the same religion that is today known as Christianity.
Similarly, Muslims, the LDS church, and others, would consider themselves the one true religion, and recipients of further revelation that is not accepted by the rest of Christianity.
Note that the question about race and Jews is irrelevant to religion.