It is unfortunate that they are no longer on that campus.
I recommend contacting the university to see if they have any records of ANYTHING pertaining to the organization or some of the members whose names you remember.
I assume it was a local so there wouldn't be a larger entity to contact. (There's another Sigma Phi Nu that was founded in 1996)
“I meant to behave but there were too many other options.” Science and religion can live together. They will annoy each other as do all roommates but if both are willing to get over themselves they can make it work more often than not.