And once again, we don't know that there was a cause for the Big Bang because we don't have evidence from that time period and our theoretical models reach different conclusions.
Unlike what some religions do, science cannot simply make up an answer and then require everyone to take it on faith. Instead, *evidence* is what is required.
As for the laws of nature, when you ask where they 'come from', you assume there was a time when the laws weren't active. That is not an assumption you have justified.
Going deeper, it is clear that to even talk about the cause of such laws is paradoxical since you are, in essence, asking for the cause of causality.