If you're saying that you cannot find a single example where a white male is portrayed non-negatively, you need to look harder. Longmire on Netflix is just one example. Jack Reacher and Bosch on Prime Video are others.

That said, there's plenty of room to make fun of white male Christians, just like there's plenty of room to make fun of everyone else. It's not like there's a shortage of hypocrisy and foibles out there.