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I think it's important to realize that Christmas has lost a lot of it's religious connotation in the West. Don't get me wrong, everybody knows it's a Christian holiday meant to celebrate the birth of the Christ. However, there is no assumption that because you celebrate Christmas then you must be a Christian. That isn't the case for Easter. People who celebrate Easter in the West are typically Christian. This makes Christmas the more publicly celebrated holiday, which feeds back into it's own popularity.

I am not super familiar with eastern Christianity, so I could be wrong. It may be that Christmas has the same religious connotations in the East as the West. If that's the case, then disregard my previous point.

Here are some other perspectives:

Jesus was the Christ before he was resurrected. The resurrection is all good fun, but once Jesus was sent to earth, the whole train was set in motion and salvation became inevitable. The incarnation of a God bringing salvation is something to celebrate.

Historically speaking, I'm pretty sure Christmas is bigger just because it co-opted all the Saturnalia festivities as a concession to the pegans so that more of them would join Christianity. Saturnalia was all about partying and beating up Jews, so it was obviously immensely popular and helped Christianity grow much quicker than if they required the pegans to give up their festival. With all the Greek and Roman influence on the West, it shouldn't be too surprising that they treat Christmas in the same way - but hopefully with less ethnically charged violence.

Finally, it's easier to tell cute stories about a birth than an execution and subsequent resurrection. "Look at the cute little baby with the animals" vs "look at the immortal zombie man with holes in his body". This matters a lot in a hyper consumerist society.