Outside Israel no man can observe the sabbath. The Christian sabbath is not one day of rest for the body, It's an Eternal Rest for the soul. Twenty-four hours a day, and seven days a week from which he can never depart, for he is sealed to the day of his redemption. The Place of our rest is not in any land but in Christ Jesus, the Place of God's Promise. Those who claim to be Christians yet observe sabbath days deny the resurrection and the Coming of the Holy Ghost to baptize His Elect into the Promised sabbath we call the new birth.
Christians have no command to worship on any specific day.
The natural, worldly church seek to observe both a fixed DATE and a fixed DAY by their strange method of establishing Easter so that it always falls upon a Friday, Saturday and Sunday. This is unscriptural and impossible. Besides, Christmas and Easter are pagan feasts introduced by the Roman Catholic church. Perhaps It will prove instrumental in clearing some misunderstanding that is hindering further Light on other issues. Maybe It will strengthen and encourage your faith by demonstrating the perfection of God's Word.