I'm not sure what you're trying to do here. It just seems a mess. As an argument, it would be, with p=live elephant in this room:
Premise 1: There is evidence of p
Premise 2: p is impossible
Conclusion: p
No, it's consistent.
The first statement is that I see a live elephant in the room.
The second statement is that an elephant can't be
hidden in that room. (Which is why I can see it -- if it were hidden, I wouldn't be able to see it.)
In this case, the second statement isn't needed to reach the conclusion: There's a live elephant in the room.
But that was just an illustration to show why both statements are necessary in the first case:
I don't see an elephant here.
It's not possible for an elephant to be hidden here.
Therefore, there must not be any elephants here.
We can contrast that with this situation:
I don't see an elephant here.
It's possible for an elephant to be hidden here.
Therefore, I don't know if there's an elephant here or not.
Or this:
I don't detect any harmful radiation in this room.
I have no way to detect radiation.
There might be harmful radiation in this room.
The point is, the lack of evidence only leads you to a conclusion if you've looked where the evidence must be if a thing is true, and the evidence is missing.
In the case of God, a new worldview has replaced the old mythological one, and in doing so has made the old one impossible. So it's not just the fact that we lack evidence for God, it's also the fact that the evidence we do have about the world contradicts what we'd expect if people had been right about God.
That's why I compare the situation to the phlogiston situation.
Note that I'm not comparing God to phlogiston, which is what makes it different from an argument which says what's true for a ratio like pi might be true for God as well. It's not that God is anything like phlogiston, or shares any qualities with it... it's that both are examples of cases in which one way of seeing the world has been debunked by a new way of seeing the world which has been put to the test and passed it.