> it seems like extremely large families in the US are almost always evangelicals

It's possible this has changed but I would name Catholics and Mormons as topping the large family demographics in the US (although in 2015, Pew disagreed¹ with my assertions about Catholics).

Does this challenge your overall point about conservatives? I'm not sure.

It is my experience that a rise in Evangelicals' political power is eventually followed by returns to their historical disregard/animosity for Catholics² and Mormons³. Being on the receiving end of serial demonization can shove folks away from the ideologies that generate it.

¹ https://www.pewresearch.org/religion/2015/05/12/americas-cha...

² https://www.ibtimes.co.uk/peter-thiel-antichrist-remarks-pop...

³ https://www.sltrib.com/religion/2026/07/02/how-pete-hegseths...