Most every true Christian understands that Christianity has its roots in Judaism. Jesus is the Jewish Messiah, and He kept the Mosaic Law all of His life. All of His apostles witnessed Him perfectly keep the Mosaic Law. He obviously, for example, kept the annual Feast of Passover (which, incidentally, foreshadowed His saving work in numerous ways.)
The early church was 100% Jewish. All of those early Jewish Christians, who lived among non-believing Jews, followed the Mosaic Law that they had been keeping all of their lives. It is clear that Peter, for example, kept the Mosaic dietary laws at least until Acts 10, which would have been seven to ten years after the Day of Pentecost.