on that, many christian sects drink poison to prove that they are sinless.
If you die, you're not sinless. Jesus' was resurrecting people, his friend, so...he's taking people from Heaven or from sleep, or from Hell? What's the point of resurrecting someone if they are in Heaven, chances are, and it says, he was asleep, when Jesus resurrected his friend Lazarus, to be alive and hopefully alive for a long time.
On top of your question Jesus said that church 'could be anywhere', you can pray anywhere, church is in the heart too. If the flesh is sinless it's keeping God in mind. If you're praying, you're going to Church. sort of.
Another question, is worshiping God a sin, if you judge too much? or at all actually so...it's basically that a sinless body probably wouldn't go to Church, seriously, the way people are these days. Jesus didn't have his own temple. Jesus was sinless. Jesus wasn't in any church much less dictating from within his own built temple. Jesus was sinless. So, I think sinless people do not go to church, except to pray on their own, especially if they are reduced to rags.