While I think modern technology superimposes immorality I don't think it is the root cause of why this generation seems to be more advanced sexually than in times past. Sure technological advances throughout the age meant evil could be done more efficiently but remember the concept had to be formed in the mind before the new way of doing something old was made to be more advanced. The biggest threat to christianity should be DISCIPLESHIP. IF believers strived to be more like JESUS everyday then "christianity" would decrease. Jesus never described us as "christians" in the first place.
He always stated that if someone desired to follow him they must be disciples. Somewhere along the way through history we only counted the 12 as the only "disciples" when in fact the entire reasoning behind selecting the 12 was about spreading the same power that he exposed them to. That's powerful when you put into the context of the Book of Acts..
SO where is our Book of Acts experience in this age? The only thing remotely close is frivilous debates about church sizes, theological beliefs, denominational dogma, political power, withcraft, sexual sin, and all manners of evil that I don't have time to call out. SO the threat to christianity is DISCIPLESHIP. Let's drop all of the titles and use them as the functional gifts as GOD originally intended.