There is no credible evidence for the existence of Christ
If we are to look at the Historical Jesus vs the Mythical Jesus we find that like so many of the other Myths of that era the stories were told they were written about but there is no actual evidence to support them.
The period in which the Gospel of Mark was written is well known among scholars of ancient literature as an era of allegorical writing. Allegory is defined as follows:
Allegory is a form of extended metaphor, In which objects, Persons, And actions in a narrative, Are equated with the meanings that lie outside the narrative itself. The underlying meaning has moral, Social, Religious, Or political significance, And characters are often personifications of abstract ideas as charity, Greed, Or envy.
In essence, An allegory is a symbolic narrative. Allegorical writing was prominent in the Greek speaking world from about the 5th century BCE onward, But there was a particular revival of allegorical writing in the 1st century CE among both Jews and Neo-Platonic Greeks and Romans. Indeed the Jewish writer Philo wrote about symbolic and allegorical interpretation of the Hebrew scriptures shortly before Paul began writing his first letters about Jesus. If we look at how the Scriptures are written vs historical accounts it is easy to see that they are allegorical fictions.
The big problem with the Christ story from a historical perspective is that outside of these allegories there is nothing mentioned in Greek, Hebrew or roman literature during the time that this Christ was supposed to have lived by any of the historians or scribes.