There is no guarantee of good health, good intelligence, good behavior. There is no guarantee that your children will outlive you. There is no guarantee that your children will be people of faith. Having children involves an incredible risk. But our experience isn't unique.
Every parent can tell the same stories.
And none of it came as a surprise. I knew that bringing children into the world and then bringing them to adulthood was going to be a great joy and hard, nasty, work. I saw it coming. So did you, or so did your parents. It's basically an irrational decision.