Design can never be an ultimate explanation for anything. It can only be a proximate explanation. A plane or a car is explained by a designer but that's because the designer himself the engineer is explained by natural selection.
I suppose if you look back to your early childhood you accept everything...
I wanted to end my life so bad and was in my car ready to go down that ramp...
All I have seen teaches me to trust the creator for all I have not seen.
