Especially Christains and Muslims. Is there a prominent female god that as big as the other two
Technically, Christian, Jewish, and Muslim worship the same "God". And have a big corpus of common texts and prophet (at the point the Koran talks a lot about Jesus) their religious differences are mostly about "interpretation" but they have way more similiarities than conservative of either religion like to admit
the trick is that the big block of Abrahamic monotheism is like the major monotheist religion. Then you have various polytheist pantheon having a mother earth figure but I don't know them enough to know how major/female would be amateratsu or patchamama Neo-Pagan also tend to worship a Godess However, it's a kind of made-up underground religion more than a major traditional one.
GPS receiver are passive device, they do not transmit your position. However, we've seen in Ukraine and middle-east that GPS are easy to jam.
As other have stated ham radio are simple to build, long range, and reliable. However, once you emmit it's fairly easy to pinpoint your position
I am not sure why Local peer to peer network haven't been a thing. i am old enough to remember the era where we had network cable hanging from the windows of student residency to build a kind of building-wide LAN, looks so much easier with wifi
Be careful with encrypted mobile phones, The Enro-chat network let the police listen to drug-lord in clear for like 2 years leading to a massive arrest. I believe it requewstd a huge work for the police to arrest them, but they've done-it Encryption may still help though, just don't over estimate the budget government can put to break-it if needed (let alone all the backdoors in commercial-grade devices).
Pigeon, dead-drop, and courrier are very efficient, it doesn't look as cool as space hacker. but this works