Absolutely, CBM bands can recreate the Black Metal sound, but for me it's not as authentic. In the sense that they encompass the struggle between good and evil, and will always choose the path of god due to their convictions. As opposed to most BM bands that embrace darkness, negativity,and or evil whether or not they are agnostic, atheist,pagan,etc. Just as NSBM or Dsbm is categorized,christian black metal to me is just that, christian black metal.
Don't get me wrong, I don't think it shouldn't exist, or can't co exist, Antestor musically is not bad. If I may though, Christians playing Black Metal is like Mexicans dressing up like the Norse and reenacting a Viking ship funeral, or like Irish men draped in full Aztec gear reenacting a sacrificial offering to the sun god. It's just not the same.