God began His work on the first day, so the first day was a workday, precisely what we refer to as "Monday", and on the seventh day He rested--thereby the seventh day is really Sunday, although our calendars show it as our first day. Either way, Sunday is our day of worship, however, if you invite God into your heart, "He" is with you always.
GOD is the "What Is", the "I Am", and there is NO "outside" of GOD, although GOD does give each of us free-will to live "Outside of His Grace"; And, because our soul belongs to GOD, thence we all return unto GOD, (Giving up our earthly ties, where-in the wheat is separated from the shaft). Those who DENY GOD and desire separation, experience the "Hellish Reality" that they themselves have created with their own "free will", and will only return to GOD by their own request.