However, I admit that I worship the God of our ancestors as a follower of the Way, which they call a sect. I believe everything that is in accordance with the Law and that is written in the Prophets
NIV
But this I confess to you, however, that in accordance with the Way [of the Lord], which they call a [heretical, division-producing] sect, I worship (serve) the God of our fathers, still persuaded of the truth of and believing in and placing full confidence in everything laid down in the Law [of Moses] or written in the prophets
AMP
But this I confess unto thee, that after the way which they call heresy, so worship I the God of my fathers, believing all things which are written in the law and in the prophets:
KJV