"a secular worldview doesn't really provide a strong incentive." I think it might be a lack of education. People are still having children out of wedlock, with

"a secular worldview doesn't really provide a strong incentive." I think it might be a lack of education. People are still having children out of wedlock, without the resources to properly raise and care for their children. When scientists speak of needing population growth, I presume they mean responsible childbirth and rearing, and not just creating babies. Unfortunately people do not take proper care to insure that the children they are creating will be provided and cared for.