You sure you have the right scripture? They weren't renaming anything.... rather Aaron built an idol for the people to worship instead of Jehovah. They were idolitrous.
This has no comparison to christmas since people do not worship a tree or anything else surrounding christmas other than christ or god.
Exodus 32:4-10 (New Living Translation)
New Living Translation (NLT) 4 Then Aaron took the gold, melted it down, and molded and tooled it into the shape of a calf. The people exclaimed, "O Israel, these are the gods who brought you out of Egypt!"
5 When Aaron saw how excited the people were about it, he built an altar in front of the calf and announced, "Tomorrow there will be a festival to the LORD!"
6 So the people got up early the next morning to sacrifice burnt offerings and peace offerings. After this, they celebrated with feasting and drinking, and indulged themselves in pagan revelry.
7 Then the LORD told Moses, "Quick! Go down the mountain! The people you brought from Egypt have defiled themselves. 8 They have already turned from the way I commanded them to live. They have made an idol shaped like a calf, and they have worshiped and sacrificed to it. They are saying, `These are your gods, O Israel, who brought you out of Egypt.' "
9 Then the LORD said, "I have seen how stubborn and rebellious these people are. 10 Now leave me alone so my anger can blaze against them and destroy them all. Then I will make you, Moses, into a great nation instead of them."
Gumby