Confident? I am confident enough to know that I am in my Lord's grip, that He won't let go off me, and that He will call me home either by death or rapture before the Time of Jacob's Trouble begins. I am confident enough to have lost 2 jobs when Christianity was supposed to be kept "hidden and private", knowing that He would take care of me and my family. I am confident enough to know that I don't need any works on my part to be saved, just believe in Him who gave His life for me and accept Him as the Lord of my life.
Osama bin Laden was also was confident in his religion as was Jim Jones in his. Are all three of you right?
Why not accept His Mother while you're at it? As far as "don't need any works", I strongly disagree. Penance is preached throughout the Bible.