Now I’d be the last person to say that Attending Sunday Services isn’t important, but I occasionally(maybe 4 or 5 times a year) miss Sunday Services. As someone said… us protestants don’t follow the ccc (also for clarification, for us, it’s the 4th commandment). The commandment doesn’t say "Thou shalt attend a formal service on the Sunday of every week."
It does say to remember it and keep it holy.
So how does one remember it and keep it Holy? Sure attending a formal service is one way to do this. But it is pretty clear it means to rest as God rested on the 7th day of creating the world. So we remember by resting… we Keep it Holy by ensuring that our focus is on God first, forsaking the things of the world we must live in. “the Sabbath was made for man, and not man for the Sabbath” (Mark 2:27). It’s not about imposing a restriction on us about what we must or must not do but instead it’s a gift from God… and offering of a day to cease our working and hurrying and offers us a chance to stop and spend time in the presence of God.
So, can I observe the Sabbath without going to a church? Yes, I can do that. Can I go to Church and still fail to observe the Sabbath? Yup that is possible too. God isn’t nearly as concerned about where I am physically as He is about where I am spiritually.