You're talking theology, I'm talking gameplay. If a timed conversion is 2 conversions, people are going to ask why a timed increase/decrease isn't one of each. Capture/Release may not apply - Jealous Rage is actually both, and I can't find any other examples.
As a temporary conversion, Falling Away also seems more like a temporary possession, Peter denying Jesus 3 times, a lapse in judgement, etc. Which is a mix of gameplay/theology.
Mostly, I just think adding extra parts to abilities just complicates rules and will break something. If it converts twice, does Altar of Dagon/The god of this world protect the EC from the second conversion, leaving the Hero permanently an EC?