However, I do not want to give him that satisfaction. Also, it would be a psychological burden for me, since I would be compromising my ideal of not lying anymore in order to hide my beliefs
Wrong approach, my friend. You want to fade, perhaps for 3-5 more years according to one of your posts, and that's a very long time. What you need then is to become less visible, not more visible; miss some meetings, attend only some of the convention or assembly, but at the same time keep them off your back by reporting enough FS time to stay out of the inactive column.
The strategy you are adopting is not going to work. You have to shed your wishful thinking, and fast. Think about this: you have been lying about your FS time for years, if you're honest about it, by guestimating, rounding up, counting break time as service time, etc. We ALL do/did it. So why have qualms about inventing an imaginary friend at work that you "witness" to on lunch hours, etc. One poster suggested you manufacture 2 hours a month and a magazine or two every several months. I'd go so far as to suggest you do that every month, but vary the hours occasionally (1 or 3), and skip a month now and then).
Much good advice on this thread in terms of lazy elders reacting mostly to the squeakiest wheels and taking the path of least resistance if you let them. That's the key. Make it easy for them to ignore you and don't raise any flags.
I've often said, the reason for fading is to buy yourself enough time to develop other interests and new friends so that when the inevitable day comes when it's time to say good bye to dubdom, you won't care!