I mean it was the sale of computer graphics digital. Other options I do not really care.
OK, I first should apologize for mistaking your gender! I never heard Lois used as a man's name before.
As for selling Art digitally - I exaggerated when I said nobody sells it or buys it in digital format. But in Every instance I have ever seen digital art sold as digital files you are not selling the art - you are selling the rights to use that art in other people's projects. For example; think of "Stock Photography" or Textures for 3D Models or even for use in Motion Graphics for video production.
Those sorts of things are the only ways I have ever seen purely digital files sold for Artistic purposes. But be aware that if you go that route, you lose any control over what sort of projects your work is used in, or how badly an end user may mangle, distort, chop out pieces from, or otherwise alter your work. If, as you said, this is a religious work - you may want to be wary of that route since the ways it could end up in use may be considered blasphemous to you. Like I said, selling Stock Art means you give up all rights to, or control over, how and in what medium your art appears. Plus, while the buyers are forbidden from claiming the art as their own creations, they are under no obligation to credit you as the source!
If you are OK with that, try to put together a "pack" of such pieces (maybe 4 to 12 works) and approach a site like Shutterstock or some other "stock art" site.
Another option is to sell prints through a site like Deviant Art. They offer all members the chance to sell their works printed in all sorts of ways. It may be worth looking into.
Finally, should you go the direct route and try making prints, prices vary widely depending on the size of the print, the paper stock, printing technique, nature of the print run (limited, unlimited, large, small, single piece never to be reprinted, signed, signed and numbered, etc) plus the dimensions of the print )in inches or centimeters or whatever unit you prefer). I have seen prices range from $3 to $500 for prints I have been interested in (though none were CGI art, the same range should apply).
If you have a printing budget, I'd suggest a limited run of something between 25 and 250. Sign and sequentially number each one of the first 90% or so (in a run of 250 I would sign/number 200) (use the format 1/200, 2/200, etc) (then of the remaining 50 sign 25 of them as AP/200 which stands for "Artists Proof" and are generally reserved for either special customers or the Gallery displaying your work) (and keep 25 for back up in case of damaged or destroyed items - These can be sold as "Unlimited Editions" should the rest sell out)