We probably agree on those but that line is non sequitur to whether the universe is contingent or necessary.
Not really, because I'm not coming down on either side in the universe is contingent or necessary debate. It might be either ... actually it might be both!
It is you who has made definitive claims - I believe:
1. That there must be necessary entities.
2. That there can be only one necessary entity
3. That single necessary entity is god.
As you are making those claims it is for you to justify them.
For the record, it is plausible that you are correct (I am agnostic on knowledge of whether god exists remember), but there are many other plausible suggestions which I am not rejecting. I am keeping my options option on the basis that we simply don't know enough. You, on the other hand, have closed down all other option that a simple one, and that is one that you have no evidence to support, and indeed has rather less evidence in its favour that many others that are supported by cosmological evidence.
