No. I believe we can observe what people say they celebrate Christmas and Easter for: the birth of Christ (the Bible teaches that believers observed their birthdays in the OT - see Job 1-3 - the Bible also does not give a specific date for His birth, so anyday we choose is just opinion - neither right nor wrong in itself) and His death, burial and resurrection (though it was on Passover and Firstfruits, not Easter, and He certainly did not die on a Friday...). Focus on why Jesus came, and why He died, and celebrate His resurrection - just avoid the paganism and commercializations of those seasons.