Can a Cleric/Paladin cast spells requiring somatic components when wielding weapon+shield emblazoned with holy symbol?

Can you use the Maneuvers Battle Master gets with a Monks Unarmed Strike?

If a human is in the nine hells, does that mean they get the Fiend classification?

Would an arcane trickster using Green-Flame blade be able to benefit from sneak attack?

If I am Wizard 2/Warlock 2, does Armor of Shadows work with Arcane Ward?