If some one has never heard of The Gospel of Jesus Christ, then they are judged based purely on their works and how they lived according to the Natural Law that God has written on the hearts of all men. For example, the Americas before Catholicism was shared with them.
His answer was essentially that we were made for God, and that God was not made for us. God enjoys and loves us, and the rest of His entire creation, whether or not we know Him. So the ability to know this in some small, human way, is a great gift given to a small minority by the mustard seed of Christ’s blood. And it is a great and precious gift to be able to share in the process of magnifying that powerful love to others in a pure way.
We are so lucky to be part of His family and to know the fullness of truth. But it is a difficult truth, and we are so frail! He is incredibly merciful to let us have the decision to love Him.
I think the meaning of life is Love, for anyone worth spending any time with. I know quite a few who are not practicing Catholics, but who do love. So it isn’t as if life for a non-believer is inherently devoid of meaning, as if to say that one must believe in God before one is able to love. That simply, in my experience of people, is not true. Love comes first. Belief in God who is Love can come after that, but not before. It can come together with it, but one who believes in God without believing in Love would be better off, in my opinion, becoming an atheist, and finding Love, and then believing in God.
So in my view, Love is the meaning of life, for believers and non-believers alike. But believers have access to more Love.