No, existence from non-existence is not only not absurd, it's what happened, Einstein. Also, there is no transcendence of both space and time, and that's why god is impossible as an existing entity immune from space and time.
And yet the laws of nature or instructions for how matter and energy behaves existed before our existence.
You erroneously assume that before our existence existed that no existence could exist before that. Since we know the laws of nature were in place we know something existed before our existence.
Our existence began with the creation of our space and time. Just because there was a point where our existence did not exist, that doesn't mean that something didn't exist before it.