In a court of law, can you have DNA or fingerprint evidence excluded because you claim God planted the evidence at the crime scene? Last I checked, you can't.
The same applies to all of science. You can't have evidence excluded simply because you assert a supernatural mechanism can produce evidence that is indistinguishable from natural processes.
By arguing against the science, you are tacitly admitting that the science points to a lack of a global flood.
I fail to see how someone's fallacious appeal to a supernatural frame job in court done to be free of responsibility compares to a belief in an actual supernatural event.
No one has said evidence gets excluded. In science evidence builds a case and nothing near certitude is a requirement to accept a theory. A myth exists in nearly every ancient culture in some form or another, is also passed down to Christianity through the traditions of the Jews. Positive evidence for a supernatural event. In that version a flood caused by God, which is said to cover the highest mountains, effects the whole earth and able to drown every thing living on the earth (including birds) that is not in the boat (wipe or blot from memory it says in some translations). Does that sound like any kind of naturally occurring flood?
Such a global flood could be imagined to lay down some evidence - which be easiest found today in sedimentary rock. Any such rock at all is in plus column - not proof - a plus as in maybe. What can logically and reasonably be excluded by Christians, agnostics and atheist alike is that science knows what such an event by God could or could not do - and therefore give us the ability to say with any confidence what the evidence from it should even look like now.
Science can only make sense out of what we see based on what we know can occur naturally. It assumes everything we see was laid down the way we see floods and bodies of water transporting and laying down sediments, then geological processes acting to end up with what we have now. That is assuming a lot of things over time have occurred exactly in the natural order that we claim to know such things as they are observable to us should occur (naturally).
Saying something occurred supernaturally, is a whole other ball game. By definition, such an event does not have to play by any of the rules we know (from studying nature). So if it happens it puts all those assumptions from all our "natural" observations up for grabs again.
Which means we cannot assume anything. We might suggest it is possible there would be some evidence of such an event, but even that is not required. We cannot even exclude the possibility many eons of layers were intentionally disturbed in any number of ways to purposefully cloud our ability to see it.
Omnipotence and omniscience rather suggest He could do such and more if desired, as well as His knowing if He didn't His Presence would eventually be declared (and so feared by many) forever more to all mankind. Assuming a desire to allow us to freely choose to love Him or not, such a declaration of His Power and Might would be counterproductive and counter-intuitive, to even us, with a true desire to want a love freely given from us all. So we should imagine that would occur to Him as well, especially since it does occur to me.
The God of Abraham, Isaac, Jacob the same One that became one of us, does not appear to me to be the sort that wants to force all of mankind to love Him, which would be easy enough for Him to do apparently, and that becomes a reality if we claim He has to reveal to us now what He did in a global flood.
So I have no problem believing He could leave no evidence at all, or evidence in a manner that makes it appear to today like something it was not - which means everything would appear as if it had various natural causes - or anything in between. So this view ranges from maybe not even a drop of water remains from that flood to full blown Supernatural cover up, because do not know what or how He did it. Absent that knowledge of both how and what He did, it is impossible to claim to know it did not happen. So even science assurance that it appears to us now that no such natural flood has ever occurred, is in fact not a statement excluding the possibility of a supernatural flood.