Pagan Easter traditions, along with Christmas celebrations, were among the first casualties of the Protestant Reformation. These holidays were eventually restored (though Christmas remains an ordinary working day in the Netherlands, and only became a legal holiday in Scotland in 1967, after the Church of Scotland finally relaxed its objections). Some Christians (usually but not always fundamentalists), however, continue to reject the celebration of Easter (and, often, of Christmas), because they believe them to be irrevocably tainted with paganism and idolatry.
That is the view of Jehovah's Witnesses, who instead observe "The Memorial" - that is, a commemoration of the Last Supper on the evening of 15 Nisan (which they call the evening of 14 Nisan), as they calculate it. Jehovah's Witnesses also do not celebrate Christmas, Pentecost, Epiphany, Halloween, New Year's Day, or birthdays, because there is no commandment in the Bible for such occasions to be celebrated - whereas there is a commandment to remember the death of Christ.
Some of today's Baptists (those formerly known as Anabaptists, and not part of the Protestant Reformation) maintain that Easter and Christmas are of pagan origins. As such, these celebrations were originally designed to worship pagan gods, and therefore are an abomination to God. To these Baptists, the Holy Bible contains the only set of instructions acceptable to God for His worship.
Other groups, such as the Sabbatarian Church of God, claim to keep the feasts and commandments of God given in the Bible, which includes a Christian Passover that lacks most of the practices or symbols associated with Easter and retains more features of the Passover observed by Jesus Christ at The Last Supper.
I'm not denying that there are those who claim pagan roots in the Easter celebration. I'm just saying they are wrong.
