SPRINGFIELD — Call it a self-fulfilling prophecy.Months after vowing it would “trigger years of contentious, difficult and expensive” litigation, the head of a Christian legal group has filed suit claiming an abortion law unfairly hurts medical centers with similar moral or religious beliefs.The Thomas More Society argues a law requiring health providers to discuss abortion or sterilization even if they have objections goes against free speech, free religion and due process constitutional protections.The …