Noah was 600 years old when the rain came down and the floods came up. He spent one of our entire lifetimes just building the ark. That project kept him busy, but life was basically the same for him until the day the Lord shut him in safety. A year later when he disembarked, life was similar and yet it could not be the same as before.
As Christians, we learned one way of living before the way of salvation. Some spent a long time in the world’s workshop, others less. But length of life in sin isn’t an excuse for staying in sin; we are all called to leave the old and live in the new. Naturally this is difficult. We have to relearn how to talk, how to relate, how to work, how to worship. We had ways of going about it before, now we have to get accustomed to going about it like Christ.
Some persons want to get on the ark and get off again with everything the same as before. They want salvation from sin and to keep living in ways that required their salvation. They might as well try to stay dry while giving a bath to a pack of lions.
The church is the people relearning to walk. We don’t always take every step in the right direction, but we keep coming together as fellow-citizens of Christ’s Kingdom to renew our training in faithful obedience. The communion meal is part of the program reminding us to give thanks to God who sent us a Savior from the flood of judgment we deserved.