I'll add some Scriptures as well, JesusIsTheChrist was right in that they should be there, this is BDF.
Colossians 2:16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
Romans 14:4 Who art thou that judgest another man's servant? to his own master he standeth or falleth. Yea, he shall be holden up: for God is able to make him stand.
Romans 14:6 He that regardeth the day, regardeth it unto the Lord; and he that regardeth not the day, to the Lord he doth not regard it.
If God does not judge believers for this, then
who are you?
Cant even imagine the chaos and judgment that would be going on if this was NOT so plainly written in the Bible...
Follow what God convicts you in your own heart and you will not sin, regardless of whether we agree on this or not.
All not done in faith is of sin.
We celebrate in faith of Jesus.