Look you are an out and out faith in science merchant by your own statement.
Just repeating something doesn't make it any more true or believable. I have 'faith' in science to the extent it is a methodology that works. That's it. I'm not, as you suggest, putting my faith in it to be able to answer every question about existence.
And you are still ignoring the point that just labelling things that you think science can't address as 'supernatural' is nothing but a silly word game.
However astronomy is based on what things in space give out. So without resorting to mere faith in science to solve everything because it has shown cause and effect in the past, what is it that the universe is giving off that tells us that it is effect without cause. Bing, Yet another reason for why this isn’t the preserve of science.
I have never claimed that the universe is an effect without a cause. As of today, the best theory of space-time we have (that is backed up by evidence) tells us that it is a four-dimensional manifold and that time and cause and effect are internal to it. It would, in that case, not be an effect at all. A quantum theory of gravity may change that or it may not. There are a large number of speculative ideas in this area but until and unless they make predictions that can be verified, they remain conjectures. They do however have the advantage that they are based on extrapolating what we know in some way or another, rather than just being baseless superstition.
It's anyway irrelevant unless you have an alternative methodology that can objectively determine the probably true from just making shit up, then we are stuck with science and logic.