According to the bible the birth of Christ was unique. Immaculate conception was something never heard of or seen before. Traditionally when thinking of the birth of Christ it is common to use the word nativity. The birth of Christ is thought to be a bright and beautiful event. Christ was born with amazing powers such as healing and regeneration and this is exactly the opposite of what the gunpowder is going to be used for. To be able to produce gunpowder Satan needs two elements from the earths core, sulfur and saltpeter. These two elements are supposedly born from darkness into darkness.
An example of dark nativity would be that of Death raping his mother Sin and giving birth to the Hell Dogs. It could be also be said that Sin was born in dark nativity from the head of Satan. Whenever the name "Christ" or the word "nativity" is used an immediate relationship to power is implied.
In the final battle when Christ is given the immense power by his father God to defeat Satan and his archangels with the fist full of thunderbolts there is nothing more powerful. Satan had thought that his gunpowder born from a dark nativity would be of equal evil power as of that of God.