Try this -
Him: Why don't you return to Jehovah?
Me: I can not return to someone I never left and who never left me.
You could go on to say -
Me: I think what you mean to ask is "When will you return to the Watchtower?" This is very difficult. The Watchtower is constantly changing its doctrines. Samuel Herd just stated that the doctrine on whether or not all the Annointed will be in heaven before Armageddon has changed again. First, it was yes. Then in 2013 it changed to "no". Now it is back to yes. Returning to the Watchtower is like shooting the bullseye on a target at 100 yards while blindfolded. Jehovah never changes. His truth is eternal.