You can handle this one of two ways:

- Spam everything that comes from their email address - this is assuming they aren't demanding to discuss your thoughts on the material being forwarded to you.

- If your friend is demanding conversations about the religious material, let them know you will no longer be accepting the forwarding of such information, and that if they can't accept you have different feelings about the material, you are sorry but will not be able to go forward with the friendship.

You can tell them that you are willing to be friends as long as it doesn't involve the viewing and discussion of those items, and that you accept that others feel differently than you do about religious matters. But if they cannot accept your feelings or are trying to bully you into digesting religious material, you will have to end the friendship.

You can liken it to being punched in the face. Nobody would call someone who punches them in the face repeatedly a friend, and you would stop being friends with that person if that was happening. Look at the religious material like you being punched in the face by this person.