I strongly believe Christmas would be celebrated even if Jesus was born in a different season. And that the celebration would be adjusted to that season.
There is already some debate about what time of year the birth actually happened. Most people agree that regardless of the actual day, it probably wasn’t Dec 25 (or the equivalent if using other calendars). That’s just the one that people agreed to use.
I strongly believe Christmas would be celebrated even if Jesus was born in a different season. And that the celebration would be adjusted to that season.
There is already some debate about what time of year the birth actually happened. Most people agree that regardless of the actual day, it probably wasn’t Dec 25 (or the equivalent if using other calendars). That’s just the one that people agreed to use.