On the contrary. Calvinists would say that Judas was foreknown and predestined to betray our Lord Jesus.
It is more contrary to a "free will" belief which would say Judas had a choice, he just made the wrong one.
Please remember Jesus himself said that have I not chosen you and yet one of you are a devil. If Judas hadn't already made the choice I wonder how Jesus knew which choice Judas would make?
Yes, that's what I said.
How about that?! According to the "free will"ers, the entire salvation of the whole world - wrought as it was by Jesus' crucifixion, resurrection, and ascension - was wholly dependent on Judas Iscariot's sovereignly free will - and dependent on Judas making a poor choice with that free will. Why, if only Jesus had acted "more Christlike" to Judas in those three years, maybe He would have lived to a ripe old age! This whole Jesus-getting-crucified thing was a fluke! We should petition Mel Gibson to rename his movie The Accident of The Christ
. Forget this whole "from the foundation of the world" stuff - God actually gambled the redemption of ALL of Creation, including Jesus' incarnation, ministry, and crucifixion, on one man's exercising bad judgement during a single week of human history, even after that man was exposed to Jesus for three years. I didn't know God gambled. Maybe God had to instruct Jesus to "really piss off Judas during Passover Week" just to set the die in motion.