How did we get from Acts to Christendom?
The assembly described in Acts of the Apostles is a Torah keeping community of shared resources, the ‘churches’ of Christendom are no such thing having their roots in Rome not in Jerusalem.
It was a long struggle against the overwhelming might of the Roman rulers and their growing hatred of anything Jewish, and the assembly of Acts was very Jewish. Over time, the gentile influence became profound, and with that came dilution.
At the core of life is the scriptures, particularly the Old Testament scriptures, but when the New Testament scriptures are taken out of their Old Testament context then a new religion is born.
This is what happened and within a few hundred years a completely different understanding grew up, and understanding based not on Torah, but on the writings of Paul.