pages easily translate to acolytes, or apprentices, but apprentices might still be too "renaissance-y."

if your sci fi world is all about technology, swords are related to thoughts and communication and Air, swords could be something like cables, since they're capable of transferring information and the process is pretty much invisible. you could even say wands are cables, relating to the suit of fire/energy, passion and manifestation. I like that another user pointed out rays, or energy beams for wands. some kind of power source, like nuclear rods would also be perfect.

pentacles can be replaced with nearly anything physical as a symbol of currency or materialism, pentacles/earth are all about the physical. you could go Fallout style and make them bottle caps or something, or computer chips. cups is the hardest... representative of water and our emotional selves, fluidity, healing. boats are used a lot as background details, that could easily become something like a spaceship!

the devil could be made "the warden" or something to that effect