Welcome.
Generally,
i suggest you look into the RHP Section,
to find material more in line with your faith.
I have to adress tho,
that this Forum is based around Black Magick,
and RHP is only an accepted branch within the board.
We do respect your faith,
to some degree,
as we respect all faith systems,
however,
real true magick,
isn’t mysticism nor Religion.
To give you some ease around this:
I suggest you try to dedicate a specific time and place either in your home,
or somewhere outside,
just for magickal practice.
Actively make a concious seperation from your normal faith there,
and state specifically,
towards that area,
that all spirits accepted there,
should be okay with you being christian,
and only offer help / workings / suggestions,
in line with your faith.
Due to that,
you will basically create a spiritual filter,
which allows for more magickal approach,
but keeps your values as base terms on there.
We do have many Christian Converts,
which basically been christian,
until they decided to give up that faith,
for better results and greater achievement along their path.
However,
as certainly most of them can approve:
That decision,
was allowed for themselves to make,
and they had also the option of turning the offer from darker beings down,
when they wanted to stick to “lightwork” only.
We generally have some acceptance and patience there.
However,
once our patience ends,
please also accept that door to be shut and closed.
As many of us darker Beings,
have been hurt and attacked,
when working with Christians,
and kind of hold a grudge there,
due to it being almost a common incident,
to not be taken by our word,
but rather by what they’re instructed to believe,
by their faith.
In terms of healing;
You should look into this:
And try it out;
To clarify:
As there are ArchDemons,
and Gatekeepers,
there are also ArchAngels.
Raphael,
is one of them,
among Michael,
Uriel,
and Gabriel.
Raphael is the Angel of healing,
and hence,
why i suggest him specifically to you here.
Michael is a great warrior and knight,
and can protect you from unwanted beings.
Gabriel is a messenger,
and can communicate with you,
and for you with other beings.
Uriel,
well find out about him yourself.
I’ve given you enough to get a head start. 
Just to clarify:
I,
Yberion,
am a middle path Magician.
I work with both,
Dark and Light beings.
However,
in terms of Christianity,
i had similar expieriences as i’ve described above,
with being attacked by Christians and their Spirits.
So,
unless you specifically call me to aid you,
i’m not very interested in spending time with you.
To further clarify:
Should you,
in any case,
try to threaten me,
either with Michael,
or due angelic attack,
i’ll take that very personal,
and act accordingly.
That,
kind of little disclaimer,
is something you might encounter with various darker beings here.
Just to make that clear aswell:
We are open towards you,
the moment you adress us,
with an open mind,
and willing to actually look into the conversation,
free from your Religious Dogma.
Which,
brings me to the actual point,
why i point these things out:
Christians usually tend to have a short lifespan,
in terms of their membership here,
because they stick to their dogma,
and believe me,
when i say:
There’s no benefit for you,
in spilling it here.
Whatever you might consider such importend scribture,
we’ve most likely,
heard a couple times before,
and don’t care,
or,
in some cases,
we’ve actually been there,
and know better,
than what’s written in the books.
Lastly,
some more resources,
for you to work with:
Raphael Sigil;
Regarding your specific Problem;
Depression;
Regarding the Angel i intentionally left out up there,
Uriel;
Sincerely,
¥’Berion