.. at Easter that my nephew, who has expressed doubts in Catholicism and God, that he should not be forced into going through Confirmation if he does not believe.
My family is very well educated and affluent. Those mentioning references to being low-class or inbred are cordially invited to go be fruitful with themselves.
I should state I’m an Athiest and think any blind faith in God is silly on many levels. My nephew doesn’t have "doubts" he just doesn’t believe. I don’t believe that he should be made to go through confirmation simply because he is living under his parents roof (since he’s under 18), and his Parents believe. If he were to choose to follow that path, I wouldn’t intervene. However anyone with doubts and whom needs support in separating themselves from the Christian mythology I am happy to support, especially my family.

It’s actually harder arguing catholocism than other denomonations. They can always use the excuse "god gave the church authority to change the scripture" to defend its more absurd beliefs. Plus, they tend to not be biblical literalists like many protestants, so they can bend and twist around examination of biblical inaccuracy.

Personally, I would focus on the historicity of the church. About how it adapted and changed based on man-made political opinion and not any kind of divine mandate.

But I would also advise against starting a public argument. Just let him know that, if he wants to ask you anything, you will talk with him. Don’t anger and embarass your family, he probably won’t respond well to it.