What about:
a) Not killing ourselves
b) Enjoying ourselves
c) Bringing children into this wonderful world and allowing them to enjoy it
d) Changing our world and making it better by using renewables and stopping fighting each other
e) Supporting the human race, not destroying it
Then, if we do all that, then we won't end up in hell, purgatory or Folkestone, provided that they even exist (I'm not sure that that last one does...)
What do you say to that?
(a) we have no choice because foolproof suicide is available in any jurisdiction unless you have a terminal illness. With the possible exception of cyanide pills given to very specific public employees such as spies and astronauts.
(b) now that we are here it is damage limitation so the best we can do is try to live as happy a life as possible.
(c) is cruel and works against environmentalism in (d)
(d) if only
(e) What does "supporting" mean? If it means making life as good as possible for people on the earth at the present time then who could argue with that?
You can't be 100% sure that there is no hell or similarly horrible place that humans go after death.
Anyway, not having children is a tiny sacrifice compared to the huge risks to all parties involved after having children. And it isn't even a sacrifice to many people as they don't have children out of choice. They believe that a life without children is better and so don't have any. People have been having fewer and fewer children by choice for a number of years and more and more people have realised that not having children is not only better for ethical reasons but also for purely selfish reasons.