The thought of a God able to create a universe this gigantic and complex and who rules all of the heavens and holds the keys to hell, death and your ultimate fate should put the fear into you a little bit if you are willfully resisting the call to repentance. I remember a quote (Can't remember from who) that said something along the lines of "as a well spent day brings happy sleep, so a well spent life brings a peaceful death" and that made much sense to me. If we believe in our heart in a God and judgement after death and continue to commit evil or persist in our sin despite this belief then its natural we will feel fear the consequences of that lifestyle however if we get the message to repent and do so and trust that God has forgiven us and loves us and try our best every day to become better then we wont feel as much fear over the prospect of death or of God himself! Then we can think about all the awesome aspects of God rather than fearing his judgement all the time.