You're aiding and abetting him though, by witnessing on his behalf about what you presume his purposes to be, supported by cherry-picked biblical citations, and encouraging others, me in particular, to accept the message. Hard to see that as anything but proselytizing.
It may be that the Lord's only purpose here is to refine my faith, Dex.
"Iron sharpeneth iron; so a man sharpeneth the countenance of his friend." (Proverbs 27:17, KJV). Thank you, Friend!
It may also be that the Lord is employing our conversation to reach out to another who is monitoring our discussion.
The religious leader Nicodemus who came to Jesus under cover of darkness arrived at Christian faith this way.
"And we know that all things work together for good to them that love God, to them who are the called according to his purpose." (Romans 8:28 ).
The Lord has His agenda and timeline.