Why would a god sacrifice "himself" or his son just to take away "your" sin?

Now hear me out. where is the logic in this? If jesus was god, why would he scream out at the end "father why hast thou forsaken me?" and another point to be brought up. Where is the sence that he would not punish US for our sins "so long as we bath in the blood of christ" yet punish his perfect son for sins he himself had never commited. How could god be so perfect yet pick men that would contradict themselves throughout the bible over and over. Do you not feel that maybe just maybe the king james version of the bible is somewhat tainted or wrong? Please, i'm interested in all educated answers and am not trying to make anyone angry.