Page "Lumen Gentium" Paragraph 18

All human beings are called to belong to the Church.

Not all are fully incorporated into the Church, but " the Church knows that she is joined in many ways to the baptized who are honored by the name of Christ, but who do not however profess the Catholic faith in its entirety or have not preserved unity or communion under the successor of Peter " ( Lumen gentium, 15 ).

In addition, the Church declares the possibility of Salvation for non-Christians and even non-theists: