What is true however is that we don't know how the universe came into existence, and we don't know what, or if anything exists outside of it.
I just want to focus on this for a moment.
You say:
(1) We don't know how the universe came into existence.
This implies:
(a) The universe came into existence.
(b) There is an explanation for the universe although we don't know it.
(c) Therefore something explains the universe that is not the universe itself.
You say:(b) There is an explanation for the universe although we don't know it.
(c) Therefore something explains the universe that is not the universe itself.
(2) We don't know what, if anything, exists outside of it.
But you've already implied that something exists outside of the universe above in implication (1c).
Unless you want to say that the universe caused itself to begin to exist or that the universe never began to exist but has existed eternally, then you must conclude that something separate from the universe is the explanation for the universe.
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