Easter is the most popular strictly Christian holiday in the US. Plenty of people celebrate Christmas while not being Christians. Not many other religion's holidays get much airtime in the US. If you're a media organization and want to publish something like this article in the US, you'd probably pick around Easter or Christmas to publish it and get the most eyes on it since it's a relevant time of a high religion's holiday. Makes sense if you want to make waves and get the article spread around a lot, get lots of clicks, etc.