score:4
It is a bit unclear in the question, but I believe what you are asking is essentially, "Can a person be so theologically informed as to believe in predestination, and yet not be truly saved?"
The answer to this is absolutely, yes. Academic assent to God's existence or to various doctrines does not imply an authentic salvation. Authentic salvation is characterized by a commitment and surrender of one's life to Christ as Lord and Saviour. It is quite possible to subscribe to something academically, and not commit one's life to Christ. The passage you quoted from James illustrates this, as does this passage:
Matthew 7:21-23 (ESV)
21 “Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but the one who does the will of my Father who is in heaven. 22 On that day many will say to me, ‘Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?’ 23 And then will I declare to them, ‘I never knew you; depart from me, you workers of lawlessness.’
When someone commits his life to Christ, he is sealed by the Holy Spirit, and the evidence of this is a changed life.