Its a moot discussion either way.
The class is defined as Attack/Support regardless.
Only classes that lack the the Support label in Cleric tree are Druid (attack),Bokor(attack), monk (attack)Paladin (defense) and Pardoner (Crafting)
but Paladin and Pardoner are very supportive. Especially since Pardoner crafts support spells 
All in all you still have two ranks as a foundation bare minimum before you’re not a support, which basically puts the overwhelming majority of clerics as being able to meaningfully contribute to the parties well being over simply DPS.

