I mean no offense…
I think you have to study a bit more and understand the field you are trying to enter. It doesn’t matter if you can easily sew something if it carries little or no meaning. Also, why are you using MS Paint? You can use Krita (and other programs) for free and it’s far more advanced.
As far as embroidery…
By hand, the points in this make it a more difficult pattern to reproduce and scale.
As far as by machine I’m a home-gamer with a “prosumer” machine. This means my machine can fairly easily replicate a nuanced design. You’re likely going to lose much of the detail in the middle when you scale down—even to the size you have displayed here.
I ran your image through professional embroidery software. I had to reduce the “noise” as your file contained some shadows and edge discrepancies. This is as sharp as I could possibly get the points. Don’t worry about the color–that’s just the threading that the program uses to help display. Notice how all your middle detail is lost as well as the points on the fleur de lis.
I would say–embroidery is simple enough, add a second color–gold or silver, add a border or lettering. An interwoven “C” for crucifers would be particularly helpful and would create a compact design.