I'm not Amy, but it may be because some think that they were chosen because of their faith. The Bible clearly says before the foundation of the world (Ephesians 1:4). If God chose before they were born, or the world was created (and He did) then how could God's choice be because of the supposed faith that some people claim. They also claim it was not due to God's looking into the future to see who would have faith. They want to make the claim that God is in all time.... and they think that God can not act in a certain point in time, due to Him being present in all time. At least thats what I think they are trying to say........lol. The same God who is in all time, claims that He chose the elect before the foundation of the world..... that just does't fit their soterology.
edited to add. John 1:13 says we were born again, not of flesh or of blood, or the will of man, but of God. Is making a decision an act of the will? Yes it is. We were not born again of our will but God's.