Nope --- your characterization is incorrect. I didn't die for my own sins, but I do believe in the Word of the God who did die for my sins. How does that make me my own saviour??? It no more does than Abraham who believed God and his belief was accounted to him for righteousness. Did that make Abraham his own promise-giver? He believed in the promise of the promise-giver. What's wrong with that???
He would never have believed if God had not made him willing to believe.
Did God make you willing to believe?
Did he take away your unwillingness?