Yes ancient cultures are fascinating and should be more relevant in the zeitgeist; especially in respect to their knowledge and sophistication in thinking.
"Apocalypse" is also a great word. It means literally "the lifting of the veil" or removing the covering, so you can see what is underneath.
True story: I was once on vacation in Greece, and saw a strip club called Apocalypse. Based on the signage, they meant that in the sense of revealing hidden pleasures rather than some final battle, but I could also see some ways that visiting that club could lead to a nasty showdown.
You have just made weddings vastly more entertaining.
A strip club being called "αποκάλυψη" would bring to mind, literally a revelation of something.
It's not clear what connection you have in mind. You could make the case that "hell" and "hall" are connected to each other through their ancient ancestry, but "hell" is no more closely related to "valhalla" than it is to "hall". "Valhalla" is just a word that includes "hall".
Consider the Norse Hel (both the underworld and the name of the deity ruling over it). Compare with Old English hell, from Proto-Germanic haljō, from Proto-Indo-European ḱelnó, "room", in turn from the root ḱel -- "to cover".
Your comment sent me on a brief etymological excursion and the words sadly are indeed utterly unrelated.
War is not the only means of conquest. Vietnam was manufacturing and drinking Coca-Cola in the 1960s, and as mentioned here, Germanic religion was interwoven with Christian culture during the Roman conquest of Europe.
One interesting and obscure connection is the origin of the words "hell" and "hall", as "hall" means "covered place" and "valhalla" means "hall of the dead" from Old Norse.
However, the original Hebrew and Greek is often "גֵּיהִנּוֹם" or "γέεννα" meaning "the valley of Hinnom." This is a physical place near Jerusalem where bodies denied a proper burial were burned, and some suggest it was even a region where human sacrifices took place.
You may be very surprised at what you find when you look into the origins of things that are taken for granted. Everything has some sort of origin, and historical roots can run very deep. Without looking at things on a deeper level, you are at the mercy of the surface-level understanding from your surrounding culture.