JMNT(i)
7 But instead that there are certain folks – the ones constantly agitating (stirring up; disturbing)
you folks – even repeatedly wanting (or: intending)
to alter and distort (turn so as to change; pervert)
Christ's message of goodness, ease and well-being (or: the good news which is the Anointed One; or: the evangel about and from the [Messiah]).
8 However, even if we – or an agent from the atmosphere or sky (or: a messenger from out of the midst of heaven)!
– should ever bring or announce something as "good news" (as the message of goodness; as being the evangel or gospel)
to you folks which is to the side of that which we announce (or: is parallel to what we announced)
to you folks in the message of goodness, ease and well-being, let it be placed on the altar before the Lord (set up as a result of a divine offering [i.e., to see if it is "accepted" by God, or "rejected," as Cain's was]; or, possibly: cursed).
9 So as we have said before (or: = above [in vs. 8]),
and I am right now presently saying again, if anyone is habitually announcing (proclaiming)
as "good news" that which is to the side of that which you receive (or: took to your side),
let it be placed on the altar before God (set up as a result of a divine offering [to see if it's acceptable]; or, possibly: cursed).