It is of first importance. Jesus Christ died for our sins, was raised up, ascended. He solves our sin problem, death and grave problem, life problem. Here is a message to save the world. Paul writes about church, body, family, pride.
Church is intimate.
Intimacy is freedom from anxiety in presence of vulnerability. Church is not to make us more anxious. We need people in life to help establish priorities, provide support, get along, only way to make it. Church must be that. No solo Christianity.