The literary character of the NT Jesus, his activities, words and associations had been used as the saviour figure from Bronze Age antiquity. To be brief; why was the virgin mother of the Egyptian saviour and god-man also called Meri (Isis Meri) and his step father called Sep (as in Joseph)? Why did this ancient saviour have 12 disciples, walk on water, heal the sick, cure lepers and even raise his friend Lazarus? The answer is because he was the saviour figure in a folk tale at least two thousand years BC. Why did Jesus walk on water? Because he walked on water as the morning Sun does rising over the sea, the saviour figure was a Sun god and the son of a Sun god, born at the end of mid-winter solstice and ascending to heaven each year at the spring equinox and dying again on the shortest day. Why were oxen in the stall where the saviour was born and why are all god-men saviours born of a virgin? Because they are references to ancient astrology (Taurus the bull and The Virgin) which system of belief preceded Catholic Christianity and remains the normative structural myth beneath most religious thought on this planet.
The truth does not need defending, it can stand on its own feet. However to promote a big lie, enormous amounts of propaganda and money is required just like the Roman Church had. They had the power and political will to promote the Jesus story and they had the information control to exclude the pagan origins of the Christ figure...and they did so very successfully.
Was Jesus a real person?...Since when have fictional characters from pagan stories started to come off the page and become real people?
(haven't listened to Carrier yet)