What date did Christianity first start?
It depends on how you define “Christianity”. The oldest books of the new testament were written in about the year 80-100 AD, after everyone involved in Christ’s life or with first hand experience of Christ had died. Emperor Constantine called the Council of Nicea in 325 AD, which is when the Bible was first put together: picking some ancient scrolls to include, and abandoning other ancient scrolls, almost arbitrarily. This was also the beginning of the Catholic Church, NOT St Peter. Protestants might say Christianity did not begin till Martin Luther, in October 31, 1517, nailed “The 95 Theses” to the door of his church. The American Christian Fundamentalist movement did not begin till about the 1930’s, and rose to power with men like Jerry Fallwell in the 1980’s. This is where we get the concepts of Biblical literalism and inerrancy. So, by the modern definition that the most vocal Christians consider to be Christianity, it is only about 70-80 years old.
