Corinthians is used by Calvinists in support of their doctrine of Predestination, and the word itself actually appears in 1 Corinthians 2:7. Being born sinless in order to give birth to Jesus Christ is what, if not the same? Yet your church rejects what was taught by the Apostle Paul on the one hand, yet aggrandizes it beyond recognition on the other. Internally inconsistent theology.
Predestination, taken in its widest meaning, is every Divine decree by which God, owing to His infallible prescience of the future, has appointed and ordained from eternity all events occurring in time, especially those which directly proceed from, or at least are influenced by, man's free will.What you have been espousing is more akin to predetermination wherein God has fixed what will be... down to our very sins. That isn't the case since God wills that none sin and none be lost. Predestination is an understanding that God knows all times and all places and it all fits His plan in Divine Wisdom. Predetermination supposes that God wanted us to fall from grace as though He were writing the plot of the book and we are merely characters acting out (even in our sin) His will.
There is no free will in predetermination. There is in predestination.