i think u can right click the skill and it will give u description
No, it does not tell what the positive buffs are.
Gospel:
Effect: With Gospel, you deal damage to enemies while giving your allies special attribute bonuses. When a Paladin uses this skill, it will affect all enemies and allies within a 7x7 cells radius with a chance of 50+5*SkillLV% every 10 seconds. Even if the caster takes damage, this skill will continue to work, but he can be silenced. When the skill is active, it will periodically drain the Paladin's HP and SP. Affected players can not use Potions, but may receive healing magic, also Gospel may cancel out all positive or negative effects on the affected targets, but it does not stack with another Gospel.