Are We a Christian Nation?

After I heard yesterday that our President stated that we are not a Christian nation, I was greatly bothered. Just a few thoughts that I have had:
1) "One nation under God"...does that not mean anything anymore?
2) This nation was founded by God-fearing, God-worshipping men using Biblical principles. Just go to Washington, DC, and see all the Scripture quotes on and around the various monuments and buildings.
3) If we are not a Christian nation, then why all the hype and promotion for this coming Sunday? What are we celebrating, I ask? It's Easter...it's Resurrection Day! It's the day we celebrate Jesus rising up from the dead. It's not about a bunny or eggs. It's about a Savior!!