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).