The crucifixion of Jesus 

??Muslims don't deny the fact that someone went to the cross and was crucified. They only believe that it was not Jesus peace be upon him.
Almighty God  says in Quran the holy book of Muslims :

 ...They said, “We killed the Messiah Jesus, son of Mary, the messenger of God.” They did not kill him, nor did they crucify him, but the likeness of him was put on another man (and they killed that man)... (Quran, 4:157)

??There wasn't any documentation of the event in the time of the crucifixion, rather the crucifixion was mentioned in the 4 Gospels that were written long time after the event took place and non of the scribes of the 4 Gospels personally attended the crucifixion.

??All the disciples ran away so they were not eyewitnesses to the event.

56 "But this has all taken place that the writings of the prophets might be fulfilled.” Then all the disciples deserted him and fled".

Mathew 26 : 56 ?

50 "Then everyone deserted him and fled."

Mark 14:50 

??Jesus never said that he is going to die or to be crucified, rather he said that he would go away. 

"Nevertheless I tell you the truth. It is to your advantage that I go away"
John 16 :7 ??

21 "For the Son of Man goes as it is written of him"

Mark 14 :12?

??When Jesus was praying before the crucifixion took place, he said that he finished his work though he was not yet crucified. 

"I glorified you on earth, having accomplished the work that you gave me to do."
John 17:4?

??If Jesus was supposed to die on the cross for the sins of humans, why was he asking his lord to save him? 

"He went a little farther on, threw himself face downward on the ground, and prayed, "My Father, if it is possible, take this cup of suffering from me! Yet not what I want, but what you want." 

Mathew 26:39?

??God promises Jesus to raise him and save his life.

??Psalm 91:14 
 "Because he loves me," says the LORD, "I will rescue him; I will protect him, for he acknowledges my name.

??Psalm 41:2 
 2" The Lord will preserve him, and keep him alive; and he shall be blessed upon the earth: and thou wilt not deliver him unto the will of his enemies."

??Jesus was talking about the sign of prophet Jonah ,and compared himself to him.That means, if Jonah was alive for three days and nights in the belly of the whale, Jesus also was alive in the heart of the earth. 

 38" Then certain of the scribes and of the Pharisees answered, saying, Master, we would see a sign from thee.

39 But he answered and said unto them, An evil and adulterous generation seeketh after a sign; and there shall no sign be given to it, but the sign of the prophet Jonas:

40 For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth".

Mathew 12 :38

??Jesus himself gave his disciples a proof that he was not crucified :

"See my hands and my feet, that it is I myself. Touch me, and see. For a spirit does not have flesh and bones as you see that I have.”
Luke 24:39

"And while they still did not believe it because of joy and amazement, he asked them, "Do you have anything here to eat?"
Luke 24:41

"They gave him a piece of broiled fish"
Luke 24 :42

"and He took it and ate it in front of them."
Luke 24 :43

Jesus ,peace be upon him , is telling them that he is alive because a spirit neither has flesh and bones, nor eats.