He said in the blood is the life. Blood needs to be shed for our sins. Sin must be placed somewhere, Christ is He who we placed it on!
Everyone has the chance to be forgiven, everyone, but until they repent and believe they won't be forgiven.
God is just my friend, it would be unjust not to punish us for our sins. God's wrath needs to be placed on someone, only a perfect sacrifice - Jesus - would satisfy His judgement and still keep Him just.