I think involving non Catholic actors in a Catholic production like The Passion is an opportunity to evangelise and also as they’re ACTORS it only matters how they portray the character, not who they are in themselves.
Non-Catholic actors are not the issue. It's using an actress who openly and actively promotes the murder of children. Would our Lord be happy with such a woman representing His beloved mother? I'm of the mind that He would not be. In the passion, Maia Morgenstern was a Jєωιѕн actress who played Our Lady. However, she was also a mother who was expecting a baby during production. That motherly love shone through her performance. Jim Cavizel's love for Jesus shone through his performance. I do not see how Gibson will be able to emulate such love through the two new actors who are hardened liberals. I also do not believe such a woman deserves to play the greatest and most holy woman who ever lived.