Hello! I just got this game and I am a little confused on something. I just picked up a longsword and it says it required Agility 2 to equip it. Both I and my first servant have an agility of 4 but it says we can't equip it. Am I missing something?

You are most likely confusing max stats with your current stats. At the start of the game you choose your max stats for the player. When you view a person's stats in game, the first column is your current stats, the second column is your max stats, and the third column will have the buttons to increase each stat by 1. Your stats will generally start at zero unless you have some kind of bonus.