Jesus can do that , but the Father can Not ? !

[The seeker]

In the name of Allah .
It is so strange that when we search the christian teaching for an answer to why did God incarnated Himself / send his son to die on the cross ? , we find an answer being taught firmly by the church to every christian , "it was a necessary sacrifice so that our sins be lefted and forgiven " or at least the sin Of Adam . But when we ask why the sacrifice ? we do not find a reasonable answer ! . lets see what the bible says about that .
In the begining of Matthew chapter 9 we read the story of the palsied man with Jesus and how jesus healed him , however let us give a curious look at the text .
"Son, be of good cheer; thy sins be forgiven thee. "
however , when the scribes denied such thing of Jesus to say he answere them firmly :
". . . But that ye may know that the Son of man hath power on earth to forgive sins" Matthew 9:6
the same thing we find in Mark 2:10 and Luke 5:24 .
And the one wonders , what power is that Jesus had on earth and The father - "the only true God"- lacks it in heavens ?! ! . How can Jesus the human be better than God and forgives the sins with a simple word from his mouth while God can not ? ! !
Jesus did not crucify his beloved Peter so he could forgive the sins of the palsied man , and you say that Allah in his glory crucified his beloved son - i.e obedient servant - to forgive our sins ? ! ! Who gave Jesus that power , does He lack it ? ! !
The answer is up to you , our dear christian brothers .
But in Islam , this issue settled from the so long time ago , Allah (swt) sayth In Holy Quraan what can be translated as :
" Say: "O 'Ibâdî (My slaves) who have transgressed against themselves (by committing evil deeds and sins)! Despair not of the Mercy of Allâh, verily Allâh forgives all sins. Truly, He is Oft-Forgiving, Most Merciful "surah Al zumar 39 , verse 53 .