Fire Resistance and Fire Protection should have their names swapped.

I think the two should swap names because the potion effect known as resistance protects from damage, but still allows you to take hits. However, fire resistance makes you completely immune to any fire or lava damage to the point where fire and lava don't even damage you, whereas fire protection only reduces damage and burn time.

Alternate idea: Make the resistance effect act similar to fire resistance, where higher levels make you take less knockback and perhaps a small chance to not even take damage. Resistance 5 could have a 25% chance to ignore damage, and resistance 1 could have a 5 percent chance to ignore damage.