"Is it still OK to have children?"
I would say yes. As Psalm 127 says "Children are a gift of the Lord"
What say you? and your religious view on this?
Two Jews, three answers.
I can only give my own view on the question, informed by Torah and Jewish tradition.
God said, Be fruitful and multiply and fill up the earth. Well, the earth is full. We are no longer under the moral imperative to ensure the survival of our species via procreation.
This doesn't mean that children aren't still a blessing. Children will always be a blessing. But like a super rich dessert, the question is whether our 600 pound bloated body should be eating that dessert.
We have reached a time in history where the population of human beings threatens the very existence of life on this planet. It becomes a moral issue from the other side. Too many rats in the cage has not only created the impending catastrophe of climate change, but has set us down on the precipice of many apocalyptic sorts of crises--worldwide water and food shortages, global pollution, mass extinctions, etc.
If the well being of our species (not to mention other species -- remember that we are the stewards of the earth) matters at all, then morally we must look for ways to radically reduce the world's population. How we can do this ethically? I'm rather lost here. It seems to me that a worldwide epidemic is the quickest most efficient way, but to DELIBERATELY release such a pathogen would be a moral outrage of its own. I think we can only hope for a natural outbreak before it is too late.
In the meantime, I can only take personal responsibility for myself. My husband and I deliberated a long time before having our two children. We thought of adoption as an alternative way to have a family. The problem is, intelligent people are foregoing children while the less intelligent are having large families -- inevitably this is going to lower the general intelligence of our species unless something changes, meaning there is a second moral dilemma to consider. We settled on two kids -- simply replacing ourselves, no harm, no foul.
I would say, however, that those who are genius material should have a great many children. After all, we need as many great minds as possible to get us out of this mess.