philosophy

If only, if only... But if your parents hadn't met, you wouldn't exist. And if someone had shot Lenin, there wouldn't have been a revolution, and if... :D

Haven't you heard of something called fate?

Now, regarding predestination, God's will, etc. The idea here is that God, when creating the world, created all possible scenarios for its development – that is, Adam could have disobeyed the prohibition, or he could have obeyed. A person finds themselves in situation A; there are several ways out of it, and depending on which path they choose, they will be presented with one of the possible following situations. In other words, a person does not control which situations will be presented to them (in one sense, they do, as they determine this with their actions, but in another sense, they don't, because the person often can't even remotely imagine what will happen to them tomorrow; they can imagine it, but guessing is unlikely), but they do control how these situations will be resolved.