there are way to many specifics.
name, location of birth, lineage, manner of death, etc, etc, etc.
all the prophecies are written by many people who did not have anyway to cooperate.
vagueness is not an issue in many of the prophecies, they are extremely specific.
please see these links, this aint something that can be passed off easily.
clarifyingchristianity.com/m_prophecies.shtml
christiananswers.net/dictionary/messianicprophecies.html
thedevineevidence.com/prophecy_jesus.html
konig.org/messianic.htm
not to overwhelm you these are just the first 4.
unless your going to claim a massive conspiracy spanning thousands of years, and hundreds of people, i think that should be sufficient.
further, the disciples, the actual physical witnesses of the fulfillment of these prophecies and actions of Christ led horribly dangerous, lives of poverty, and deprivation, risking life and limb for decades after the Crucifixion, then, in the end they were tortured to death rather than recant their belief.
i would doubt any miracles i saw 40 or 50 years after the fact, but the idea that these men and their own followers accepted death by torture rather than recanting, means to me that the experience of those miracles was so strong as to be more important than their very lives.
i cannot reasonably believe in any ‘conspiracy’
so as the prophecies are many, and most specific in nature, i see that Christianity is a mathematical certainty
if you peruse all the prophecies, you will see that many are very specific. if only a few are true, the mathematical odds quickly become overwhelming