When a person decides to follow Jesus first of all let’s be real about Jesus. He is omniscient which means that ‘He knows all time’, past, present and future. So when someone decides to follow Him, He knows the past, present and future results of that decision already whether we do or not. Now you have to decide but based on what He already knows if it is a good decision then we die to this World just like He did and we are a new creation like He was.

So it is not something that you do or don’t do-it’s Him. You made the decision but He make's any Spiritual changes.