Cure only needs to be Level 1, unless you actually want the magic circle duration to be longer. No matter what level it is, you will only be able to remove Level 1 abnormal statuses. Try to make Deprotected Zone Level 4, it has an attribute that sword attacks on enemy targets affected by Deprotected Zone will receive a weakened defense status effect, and it stacks up to ten times.
Level 5 Aspersion is generally in my opinion the maximum that it needs to be. 28% of bonus Physical Defense is really good as that means allies receive a bonus equal to 1/4 of their PDef. Anything higher than 4 is unnecessary because you can use skill points for other things, and you’re raising the SP use of the skill as well. (SP usage shouldn’t be TOO much of a problem for a support, but you get the gist of what I mean.)
Monstrance is worth investing into, it reduces the enemy’s Evasion and Physical Defense. It can be combo’d with Deprotected Zone. It also increases the DEX of allies, and DEX is pretty important in the game.
Divine Might is pretty useless as of right now, since the bonus isn’t truly game changing. Also the fact that you can put points into other things that helps your team more.
Resurrection and Revive should be Level 5. In my own opinion I love being resurrected with 25% HP Recovery as that usually secures the chances of me not dying when coming back right away. 
I know, I suck. If you don’t want to do this, use the skill points for whatever suits your preference I guess.
Mass Heal is crazy strong and I feel the minimum skill points invested into it should be Level 2 or higher. Keeping it at Level 1 is like saying you don’t like it.
At least having one point invested into Faint is always good. Sometimes you forget about it, but when you do remember… it’ll save your ass in group PvE when the uncommon time comes.
I don’t know about you, but putting Guardian Saint onto a tank in your party is pretty useful to reduce the damage taken onto yourself. I’m sure the bulky guy with you wouldn’t mind if he likes to be your prince saving the damsel in distress if you know what I mean. Oh wait, you’re a guy.
It seems you don’t have a good idea for your last class. Try Krivis, since the skill called Daino increases the amount of buffs your allies can receive and have at one time. The maximum amount of buffs a player can normally have is five.
An example of all these changes look like this:
It tries to keep the same concept you had before but be slightly better. If you want a fully revamped skill tree you can ask. (Meaning class order be almost completely different.)
Note: In case you’re wondering about Blessing and also Sacrament. The bonus damage from both are generally both under 50, and even when combined don’t go over 100. Meaning that they’re somewhat useless in very high levels even when combined.
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