I used to do this exact thing. You need to first examine your community and see if it would be profitable for you to do this. Is there a need? Is there demand? Where would your gigs come from?

As far as equipment goes, it depends on what you want to do as a DJ as well as what source you will get your music from. CD? MP3? I wouldn't go vinyl for Christian music. There simply is not enough.

I will post more later when I have more answers.

Listen to Chris here...you have some misguided perceptions of what you are going to run into.  Unless you convince a few local churches or wedding type arrangements there wont be many to play for.  Learning to DJ would be a good place to start, go from there. 

Laptop and Traktor Studio + controller gets you going. 

Or if churches will part with any money at all.......... (just had quite a few stingy ones)

its awesome that you worship with the decks, i do just that on occasion. but T4CM wants to start a DJ company that plays exclusivly christian music. which is awesome. but it wont work it if wont make money. just like if i wanted to start a christian music store that no one bought from.

Are you paying for the kit yourself or is someone else fundin it.. dependin on that choses what kit you can or need to get. Im not sure what stage your at.. Jus remember your guna have to get the music as well as the kit. An depending on what the audience are like you may need to keep up to date with many and it can become quite constly.
We were able to get funded for ours and were lucky enough to get some technic 1210s, 2x behringer b300 speakers, 2x pioneer cdj100s, (fink 100) a Korg Kaos Pad 2, and some mics.
It worked really well, i got taught to DJ, an we had some really good events goin for a few years.. now though alot of the youth hav moved on and not so many came through.. one pioneer deck broke, 1 speaker blew.. the technics (shamefully - like most the kit) appear to rarely be used now.. Im currently at uni so i dont get them out, the fundin is not there to keep them up. Originally you could rent (people like me) to do mates birthdays, but i was only one giving any money towards.
I know have my own set of Axis 9 CD decks, and a Total Control.

So make sure you look at what is happenin.. and is it better to buy a midi controller such as the Total control, or a CD package such as the axis 9 with a mixer, or pioneers cdj's. If you already have a laptop maybe a midi controller and soundcard may be a better option.. see how things go and what funding or money you make before upgradin. If you know other DJs in the area get them in with their kit aswel. Depends if your tryin to look cool with decks.. or your doing it for the music and people

I doubt he's looking at technics. since he's gonna be spinning cd and mp3.

but do you say you have a bunch of gear not being used?

www.djchat.com

Has a dedicated Christian Mobile DJ forum.