You don't want to use mIRC that's not from a trusted source, because you don't know if there are any hidden things infecting it or bundled with it. has a link for 6.35 or the current version.

I googled for it using search terms mirc 'christian command'
and found a website hosting it. It's an .exe that can't be viewed by 7zip, so I'm not going to look at it to see what's in it. However, the page describes the script as being 'for windows xp', so it's going to be a fairly old script. If it won't run in the newest version 7.52 of mirc, it might work in the 6.35 that's also available for d/l at