"Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?"

"And what concord hath Christ with Belial? or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people."

2 Corinthians 6:14-16, one reason why Puritans did not celebrate Easter. Another reason was that the celebration (as opposed to the event commemorated by the celebration) doesn't appear in the Bible.

Some Christian groups continue to reject the celebration of Easter due to perceived pagan roots and historical connections to the practices and permissions of the "Roman" Catholic Church. Other "Nonconformist" Christian groups that do still celebrate the event prefer to call it "Resurrection Sunday" or "Resurrection Day", for the same reasons as well as a rejection of secular or commercial aspects of the holiday in the 20th and 21st centuries....

Members of the Religious Society of Friends (Quakers), as part of their historic testimony against times and seasons, do not celebrate or observe Easter or any other Church holidays, believing instead that "every day is the Lord's day," and that elevation of one day above others suggests that it is acceptable to do un-Christian acts on other days....

Today is Easter, a day that is celebrated for religious reasons and, alternatively, in a completely secular fashion. It is also a day that some people do not celebrate, and the reasons for noncelebration can also be religious — even among Christians — as well as secular.

Opposition to a celebration can be based on a problem with that particular celebration — as the Puritans objected to Easter because it's not in the Bible — or on a more general objection to holidays — the belief that all of our days deserve equal celebration. That idea too can be religious. As the Quakers say "every day is the Lord's day." And that idea can be secular: the recognition of the beauty and promise in every day.

Happy Easter/Happy Day to everyone, believer and infidel, yokemates and yolkmates.