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Spiritual Weapon is a much better choice than a bow as long as you have spell slots available, bow is still a nice fallback. Note that it is in the form of a Rapier and has the crit range and multiplier of that weapon. If your level were equal to your team mates I would suggest Shield Other, but your HP is so far below them, it is just suicide.
Don't overthink your character too much. See what your group needs and try to fit into that, unless it's no fun for you. Thistlefoot alludes to groups that hit on a 2 and are hit only on 20s, if you are in this kind of group, there won't be much need for a healer which may not be a lot of fun for you. But you may also find that you are the only one who does any damage at all. I was recently in a level 6-7 PFS game with a 4th level melee specialized fighter and was the only one doing damage, with my bow. I had the only character with a range weapon of any kind. A lot of specialized builds see their damage output drop to 0 if the encounter is outside of their specialization. If there is a gap like that in your group you could try to fill it.
BTW the only equipment you really need is a holy symbol, and Cayden's is a tankard. ;)