In cosmology, many common theories require something to have existed prior to the big bang. In theology, the requirement prior to the universe is to have a sentient, powerful god that's always existed. In cosmology, the pre-universe state is typically a relatively simple environment. Depending on the theory, it could be essentially nothingness, or it could be large blobs (think of a soap bubble) floating around in 11 dimmensional space. Whatever the theory, though, you must agree that it seems more likely than a sentient, all-powerful being who's just 'always existed.'
Interestingly (and couther-intuitively) enough, our universe appears to be made up of a net sum of zero energy. This means that it can essentially spring from 'nothing.' There will likely always be questions to be answered by science, but saying that there are questions that science will never be able to answer is a bit pessimistic considering all the so-called unexplainable things that now are well-understood.
If you want to learn about science, don't only watch you-tube videos that seem to confirm your preconcieved notions, challenge yourself and challenge your confirmation bias. However, if you wish to remain a theist, best not look too deep.