Asked in The Bible
Why can't mankind stop having babies so that humanity's cycle of sin will come to a end?
It was a belief of some early Gnostic Christians that it was wrong to bring children into this evil world (as they saw it). Quite contrary to much modern Christian dogma, they held that sex should only be permitted when conception was not likely to happen, and a perfect marriage should be without sex.
Human nature being what it is, this Gnostic idea never received much support. So, perhaps we should focus less on the idea of sin, and more on what wonderful gifts that children are.