Did Judas play an important role for God’s salvation? In reading the bible, we see Judas as the great enemy who betrayed our Lord Jesus. But looking in a different perspective, was his role gave benefit for the fulfilment of death and crucifixion of the Saviour Christ. Without Judas, would there still be a death and crucifixion?
In Acts 2 Peter addresses a Jewish crowd and says that the death of Jesus was both the act of humans and the plan of God:

Acts 2:22-23 NIV: Fellow Israelites, listen to this: Jesus of Nazareth was a man accredited by God to you by miracles, wonders and signs, which God did among you through him, as you yourselves know. This man was handed over to you by God’s deliberate plan and foreknowledge; and you, with the help of wicked men, put him to death by nailing him to the cross.

This reflects the traditional compatibilist view that two things are simultaneously true: that God's will is completely sovereign, while humans have real wills.
If Judas had not desired to betray Jesus we can conclude that Jesus's death would have gone ahead according to God's plan. Indeed, even within the Gospels it's not really clear that Judas accomplished much; the Jewish leaders knew who Jesus was and he wasn't trying to hide from them. Perhaps all that Judas accomplished was alerting them to where Jesus was at a time when they could arrest him without the whole city observing, so that he could be killed in time for Passover.