For Christians (or anyone else) who deny Darwinian evolution.

[Angrboda]

You're simply altering the hypothetical in order to avoid the conclusion.  Do you deny that information in the genome can be lost due to mutation?  In no clear sense does the term recessive apply.  Recessive traits can express themselves without a change in the DNA.  This is not at all analogous to the hypothetical given.  The hypothetical given was an example where the information was actually lost.  You're simply choosing not to answer the hypothetical.

To answer the hypothetical then C could never be.

And what's going to stop it?

Typical of you. When reality delivers a result you don't like, you simply deny reality.