I have no problems with saying "I do not know".
Thus the fact is, in fact, not a hindrance for those not making claims how they originated.
Supposedly when the Buddha was asked if there was a creator-god, his response was that the question was irrelevant. Since he didn't explain his response, it was left up to his followers to try and connect the dots.
What they concluded was that what may have started all was not important, but what's happening today is. Also, there was the question as to exactly how would a deity that supposedly created all come into existence by itself? IOW, things do not appear to happen all by themselves, so why should anyone assume that some creator-god just popped into existence, uncaused. And then why should one assume that this supposed creator-god always was when our experiences seems to indicate that everything appears to be in a continuous process of changing.
And then there's the question as to who was there to see it happen in order to know if there was a creator-god, creator-gods, or none of the above?
So, my point is in agreement with yours above, namely that I don't think saying "I don't know" is a sign of weakness, especially when compared to believing that which cannot in any way be objectively determined.
Just a thought.