That depends on whom you ask, as those who are as culturally (or actually) religious as your Muslim friends and family would react the same way to someone in their family declaring they don't want kids. In other words, it is likely just you not realizing many American Christians' lived experience, as that is not your own lived experience. I see a similar phenomenon with my Indian family thinking that Americans are more cavalier and distant with their children and that Indians treat them better, when in reality they simply don't know the lives of many other Americans.
My Bangladeshi parents said something similar: “Americans don’t love their kids.” And while that characterization isn’t quite true, I’m married into an American family, and the stereotype does have a factual underpinning. That’s how the manifestations of individualism—particularly among WASPs—is perceived by south Asians.
Exactly, it's a cultural thing, not a religious one. See, for example, how a lot of Hindu Indian parents would react similarly.
The same is true for secular Americans. As an outsider, it’s quite obviously an outgrowth of mainline Protestant Christianity.
While too many religious people let their cultural and other beliefs/values contaminate their religious practice, it is still pretty simple to draw a line, and it's silly to try to infer something about a religious group based on the attitudes of your irreligious parents.
As a couple of us have pointed out, the same attitudes are exhibited by non-Muslim South Asians, so why are you still asserting their views reflect some vestige of their ancestral religion as opposed to the culture they come from?
Asia offers a good example of how religion makes a difference. The whole area has been the subject of extensive population control efforts. But the Muslim fertility rate in India is markedly higher than the Hindu rate. And the fertility rate for Indian Buddhists is much lower than either, and closer to East Asian countries with a strong Buddhist tradition.
Citation needed, they've been converging for a while now.
By contrast, I feel like most American Christians wouldn’t react that negatively to someone in their family declaring they don’t want kids.