Waxit, we were made complete in Christ, who observed all the tenets of the law. We were circumcised with him (so, for males, that's the end of mutilation of private parts). We were buried with him; we were baptised in him, we were raised with him. Jesus took away our sin and our sins.
I wonder, do you think Jesus is alive and well, observing the sabbath in heaven or wherever he is?
We who believe kept the law with him, we kept the sabbath with him, and we are freed from the law with him. For the dead are not subject to any laws.
I believe that Jesus is alive and well in his spiritual body, in my church (and in many others) and in that form he observes a sabbath rest (of sorts) on Sundays and other days too. I say "of sorts" because the good work of my church doesn't stop on Sundays, but we're out there looking out for hurt and needy people, and fellowshipping with each other. We do that on Mondays, Tuesdays, Wednesdays, Thursdays, Fridays AND SATURDAYS. I believe Jesus is with each one of us as we do that, too.