I have a number of motives.
To present Scritpure which may yet lead to
@Ferris Bueller , not that this is who this is, I'm pretty sure! which may yet lead this person to a greater knowledge of God.
To show the fallacies in these arguments for others who may be reading.
To practice my abilities to accurately understand other people's views, and to clearly and accurately articulate mine.
To do the thing I love to do, speaking of God, with the people of God.
And yes, to declare the beauty and wonder of His salvation!
And regardless of anything I just said . . . my true motives will be revealed by Jesus. May I be sincere in everything!
Other people's motives, I can't say.
But I can look at the fruit of someone who teaches that God's salvation is somehow incomplete, that you have to finish it off yourself. That was under the Law, and it seems that some people just can't get away from that thinking. I know, it's hard to do sometimes! It seems so ingrained, we have to be responsible, we have to be accountable, and we are, but not for our eternal life. That's what being saved is. God has rescued us, and rescued we are!
Much love!