Necessary for what, EB? Are we given eternal life because we do good works or because we believe in God's only begotten son? Let's see if you can understand what Paul was teaching here:
Of course he doesn’t understand; when I quoted that to him many threads ago, he said that only heretics believe that.
When I quoted him on this thread, he went on about heretics.
He’s refused to answer over and over just a plain yes or no about whether he believes it.
So that leads me to think that no, he doesn’t.