Growing up as a Catholic, we did it all up like the rest, the decorated tree (Jeremiah 10 , tell me you don't see the modern Christmas tree in all that) the food, OH the food...my grandmother came from Northern Italy and cooked up a storm, many awesome dishes. We knew eventually that there was no real "Santa" as with 7 of us, we would eventually find the presents hidden... but still...we did not have any idea that everything we were doing was promoting material things and paganist practices.
It's a tough one. It was VERY confusing as a child learning about Santa and Jesus too. Not to mention the big-bang theories we a learned in school and the creation we are taught in Christ and the word of God. Boy, people really have to seek Him to find Him...with ALL their heart. He IS a rewarder of them who diligently seek Him.
Yes, this is a tough one.