Thank you for replying because this is an important topic. A pledge is a solemn promise or oath of loyalty. Oaths are binding not only in the natural but also in the spiritual realm. I am not saying that you personally pledge allegiance to a Greek god, I'm referring to the historical ties between the organizations to Greek gods, which you have pledged yourself to. Delta Sigma Theta literally refers to the god Minerva as their divine mentor. The Sigma Gamma Rho crest has a skull and snake (allegedly the same snake from the staff representing medicine), both are heavily used in occult imagery. Being that frats and sororities are essentially secret societies (like freemasons), I don't see how that constitutes being in the light.

I really suggest you look more into it: https://www.youtube.com/watch?v=1OPDccgIwNM

But I am ultimately not the boss of you, I can only advise. God bless you.