IDIOMS

mere mortal

(idiomatic) An ordinary person; Someone without special abilities or status.

Example: One who is not a god; a human being.
2011, Matthew Stover & ‎Robert E. Vardman, God of War, ISBN 0857686534:
  Show all the gods how even a mere mortal can best Ares's plans and defeat his will
2014, John Viescas & ‎Michael J. Hernandez, SQL Queries for Mere Mortals: A Hands-On Guide to Data Manipulation in SQL, ISBN 0133824845, page xx:
  If you use computer applications that let you access information from a database system, you're probably a mere mortal.