Greetings
If you are talking about "True" Christianity then it is not Christianity at all. Y'shua was a Hebrew and did not call himself a Christian. It was later during Paul's time when the term Christian became a definition of one who follow Jesus Christ.

There were Essenes who were considered as "true" christians by many. But in reality, they followed Mosiac law.

Many say that Christianity(new testament) was the fulfillment of Judaism(the old testament).

Many also say that Rastafari is the fulfillment of Christianity.

Christians hail Y'shua, who followed Judaism, as their Messiah and Rastafari hail Qedamawi Haile Selassie, followed Christianity, as their messiah.

So in essence, Y'shua is the only "true" Christian and Qedamawi Haile Selassie is the only "true" Rastafari, since both carry their namesake.

So If "true" Rastafari is to follow the bible as Qedamawi Haile Selassie did, then "true" Christians should follow the Torah, and Torah alone as Y'shua did.

Give thanks