patricia jannuzzi , wrote in a facebook post that gays were behind an ` agenda ' to ` reengineer western civ into slow extinction '
an outcry ensued - including from school alumnus scott lyons , who 's aunt is actress susan sarandon .
jannuzzi was put on administrative leave last month , but there was then a backlash from conservatives .
monsignor seamus brennan said in the letter that catholic teachers should communicate the faith in ` a way that is positive and never hurtful '