The mission of the Church is to lead all to eternal life with God.
How can this be accomplished if only 22-30% if registered Catholic parishioners attend Mass on a regular basis?
I agree that division in the Church is a problem, among many problems and society (the world) seems to encourage this.
From Catholic.com: https://www.catholic.com/magazine/print-edition/the-truth-will-make-you-free-0
The fullness of happiness is found in the encounter with Christ, who is the most complete answer to the question that is every human life. Following Christ is the foundation of Christian morality. John Paul wrote, “The decisive answer to every one of mans questions, his religious and moral questions in particular, is given by Jesus Christ, or rather is Jesus Christ himself” (VS 2). The guide for the Christian life is not a set of rules:
Jesus way of acting and his words, his deeds, and his precepts constitute the moral rule of Christian life. Indeed, his actions, and in particular his passion and death on the cross, are the living revelation of his love for the Father and for others. This is exactly the love that Jesus wishes to be imitated by all who follow him. (VS 20)
To love as Jesus loved is to share in the life of Jesus, the life of grace that enables weak human beings to act beyond their limitations. It is not possible for anyone to imitate Christ through his own power.
How do we get there and help others?