Some do, some don't. Charles Darwin was entirely ignorant of Big Bang cosmology, but that in no way hampered his insight.
Therefore, it is relevant where the "bang" came from. Whether it was an "explosion" or a sudden appearance of something from nothing that made a bunch of hot stuff and spun a bunch of stuff around (stuff, of course appearing out of nowhere) is kinda irrelevant. The theory does not make scientific sense.
To me it makes perfect sense. When you say that it doesn't make scientific sense, do you mean that you don't understand it, that you don't like how it sounds, or that the math doesn't work out?