First of all, if Christ is not fully God and fully man all in the same body then it was not possible that Jesus could take all of our sins. We have been made complete and full (fully forgiven) in Christ because he was able to be to propitiation of our sins. He would have not had the authority to do this otherwise. Without Jesus being fully God and fully man, our sins would still be a mill stone slung around our necks.
Second, Christ had to be willing to take on a criminals torture in order to nail our sin record or "certificate of debt" to the cross. In bible times, a certificate of debt was an official document written in a debtors handwriting that they used to acknowledge their debt to the indebted. Christ on the cross acknowledge this document and then canceled the debt by "taking it out of the way, having nailed it to the cross".
To sum up the points: Christ had the Godly authority as well as perfect human existence to qualify as a sacrifice that would allow our sin record to be canceled.
On top of all of this, Christ not only forgave ALL of our sins (which is more then enough) he also disarmed all other "demonic powers" that may utilize false power of us. I love how Colossians 2:15 says "He made a public display of them, having triumphed over them." In modern day terms, Jesus slapped 'em all in the face and showed He was da man!
Now that ALL of our sins are forgiven and ALL powers have been triumphed over, what do I need to do now? Well, being free from legalistic powers and the shame and burden of my sin records frees me live a life used to glorify God. I can now access the power of the Holy Spirit to move towards the fruits of the spirits. I can work to be sanctified (made more like Christ). I have no more hoops to jump through, I have only a God to glorify!
Prayer: Thank you Lord for canceling my debt. Thank you for being willing to take on human form to come and be the sacrifice that I could not be for myself. Neither my sins nor false rulers and authorities have power over me. Holy Spirit, reveal to me the sins that I hold so dear and guide me towards your glorification. Since I am no longer a slave to sin, let me be a bond slave to God!