"Let me try this from a different angle. There exists in Arabic a large body of what for lack of a better term might be called "Spiritual Songs", basically folk type music with a religious theme. There's plenty of it on You-Tube if you wish to investigate it. In Egypt people listen to them in the car,while working etc, instead of listening to popular music. What you hear at Coptic youth meetings is an attempt to do the same thing in English. Many songs are in fact translations of Arabic favorites, some did in fact originate with English speaking Protestants. I don't care much for them myself (I like the Arabic ones better, probably because I don't understand them well enough to dislike them), but there's not a lot of harm to be done by them to a person who otherwise has access to Orthodox teaching. Certainly better than what's on the radio."
They are not singing Christian Arabic folk songs, they are singing protestant praise and worship songs in the context of worship. They also are not singing songs written by Orthodox people, but are written by protestants and have protestant theology expressed in those songs.
I'm not sure that its an attempt to do the same thing in English. They were not singing those songs just for fun, but in the context of worship. These songs express the theology that God became Man to suffer punishment or that He needs to calm down so He can forgive us. This idea of salvation is not Orthodox, Oriental or Chalcedonian. The songs are also very "me" or "I" focused rather than focusing on God.
"I'm beginning to get a sense of why they may not want to attend the OCF events."
We have a good relationship with them, most times, a few will attend our 1st meeting in the semester, then we never see them again after that. We are always inviting them to all of our events, they always do not come. Our meetings consist of a reader's service, book discusssion, speakers, and other activities. We go to their meetings once in a while. We've never had a conversation with them about how the adoption of protestant/rc practices will have to stop.
Nonetheless, we as the OCF will testify to the Truth of Orthodoxy, and we will speak the Truth, hopefully by God's grace and mercy, on love.