Although Easter might be a pagan holiday, and unfortunately Christ's resurrection is affiliated with a pagan name, the Church has used something that might have been ungodly, into something godly. We should not get caught up with what Easter meant, as that is a tool of Satan to get our eyes off of Jesus. We should look at Easter Day as the day Christ rose from the dead. His resurrection verifying proof that Christ is who He said was.
Now if you have a problem calling that day, Easter. That's fine. You can go ahead and change it to Resurrection Day if you like. The bottom line is that it's just a name, and it does not distort the fact that Jesus rose from the dead.
Here's my biblical basis.
Romans 14:5-6
One person esteems one day above another; another esteems every day alike. Let each be fully convinced in his own mind.
He who observes the day, observes it to the Lord; and he who does not observe the day, to the Lord he does not observe it. He who eats, eats to the Lord, for he gives God thanks; and he who does not eat, to the Lord he does not eat, and gives God thanks.