The Bible says that without the shedding of blood, there is no forgiveness of sin. Jesus died on the cross to bring man salvation; to bring us closer to God and to redeem us from the curse of sin.
He has to die to ransom us. He has to replace us at the judgement thereby freeing us while He is being punished for our sin.
The main thing here is that the cross was the place of punishment and also the place where the victory over sin was declared. Without Jesus shedding His blood at Calvary, it would have been difficult for us securing salvation.
Someone has to be punished for a sin or an offense. Look at it this way: in the court room, the accuser successfully made a case against the “offender”, the judge passed a judgement and declaring that according to the law, you must die for your offense.
All of a sudden, someone just showed up and tells the judge that he will serve your punishment and that you are free to go. The judge then agrees. And you leave the court room as a free person. Yes! that’s exactly what happen when God passed a judgment on us for our sin but Jesus stood in our place so we do not have to suffer.
He suffered on the cross the punishment for our sin. How grateful we ought to be. The cross was the deal and will remain relevant while the earth last.