Marcion: The first Protestant reformer?

Are you familiar with the second century leader Marcion of Pontus? Do you know what he taught? Various Protestant scholars have called him "the first Protestant." Marcion was denounced as "the first born of Satan" by Church of God leader Polycarp of Smyrna. Others also denounced him in the second century, yet at least one Protestant referred to him as the original Reformer.

Basic Doctrines of Hebrews 6

Hebrews 6 discusses six basic/elementary doctrines that Christians are expected to know so that they are able to gone to perfection. They have been called "the six great doctrines of Hebrews 6."  These doctrines are "the foundation of repentance from dead works and of faith toward God, of the doctrine of baptisms, of laying on of hands, ...

Sunday: First and Eighth Day?

Where did Sunday come from? What do all the scriptures in the New Testament say about the 'first day of the week'? What does ogdoad mean? Did early Greco-Roman writers write about that and tie it in with Sunday? Why do Protestants keep Sunday? Why do Protestants, Eastern Orthodox, and Roman Catholics consider Sunday the eighth day? Did Plato have anything to do with it?