Easter and Christmas are the only two big holidays of the Christian religion, but I would argue that Easter is the more important. Yes without Christmas, Easter isn't possible, but it's not enough that Jesus was born. He had to die and be resurrected to. And without the resurrection, well, Paul says it better than I do in Corinthians:
"And if Christ has not been raised, then our preaching is vain, your faith also is vain. Moreover we are even found to be false witnesses of God, because we testified against God that He raised Christ, whom He did not raise...if Christ has not been raised, your faith is worthless; you are still in your sins."
~ 1 Cor. 15: 14-15, 17
So praise God for the resurrection, which gives us hope, new life, and salvation.
He is Risen!