Clip one is a typical fallacious argument among theists. It's the "we don't know an answer, therefor God", the God of the gaps argument. Not to mention that it simply lies about the position of non-theist mathematicians. They don't simply assume math working is "coincidental" they say they don't know but they have plenty of non-God hypothesis.
en.wikipedia.org
Clip two is also a well trotted path.
Causes bring about effects, not the other way around. And you can’t apply probability cumulatively and retroactively. It has to be applied independently and going forwards. In other words, you assume that because the universe here exists now; as it is, that that's the only possible way a universe can be.