How would you define "definite"?

(Disclaimer, Catholic perspective, but all deviations from Catholic doctrine below are my doing): proof of God implies that God is a natural phenomenon, but monotheistic religions generally treat God as supernatural, such that an observable explanation doesn't make sense. An all-powerful god can personally manage all physical forces all the time in order to create natural outcomes, or can set them in motion and then kick back; there's no observable difference. And many specific natural phenomena were once attributed to the divine (thunders, floods, earthquakes, etc.) before being identified as natural phenomena.

Supposing we had some science-based explanation for a miracle—at that point, it's no longer miraculous! It's just part of the way the world works! Richard Dawkins will have a chapter in one of his books talking about how naive Christians used to believe that the Resurrection was evidence for God's existence, but of course all educated people now know that a Nazarene carpenter executed by Roman authorities could die and come back from the dead for perfectly understandable and predictable reasons, so it's no more evidence for the Christian God than thunder compels you to worship Zeus.

This is frustrating to anyone who treats the scientific method as the sole source of truth (been there!) but that itself is often an under-examined belief system; you can't science your way into it, but the social pressure to adhere to that belief system is subtle enough that you might go along without thinking about it—an argument no doubt familiar to most atheists.

If a loving God exists, why didn't he stop the Holocaust? Why does he create babies with progeria? Or chestburster parasitic wasps?

This problem of evil and non-intervention was also Eliezer Yudkowsky's argument against nearby friendly aliens, on a recent podcast.

It seems more likely we live in an amoral physics simulation rather than a well-ordered universe designed by an intelligent, omnipotent, omnibenevolent creator.

@ImperishableNeet I don't think the question required God to be omnibenevolent? I would like a definition of God... Does any intelligent agent that created the universe count?

In what format? A proof evaluated by who?

@extent_of_foxes By God I'd assume