Russell Wilson says he knew from day 1 that helping to raise Ciara's son with Future would become his new burden and responsibility in life -- comparing himself to Jesus' dad.
The Broncos QB -- whose future there in Denver seems uncertain at this point -- appeared this week on the 'I Am Athlete' podcast ... where he talked about his marriage with Ciara and the fact that he plays stepdad to her kid, Future Jr., who she shares with the rapper.
Take a listen, 'cause this is pretty eye-opening .