It is interesting that this is one of the things that Ed Dunlap was most concerned about - that the WTBTS had done such a terrible job representing Christianity that he felt many witnesses who left were simply burned out on all religion and would just give up on it.
Here is a premise we cannot afford to overlook.
If nothing at all were wrong with the transmission of the WORD in the Bible and as represented by mainstream christianity (that is, no demonstrable corruption of a significant nature) then Jehovah's Witnesses could not get their "hooks" into you.
The HUGE mistake JW's (who stay in) make is thinking it is EITHER JWdom or corrupt christianity that is the only choice.
A middle ground can and does exist. Being practical, for one thing. No matter who claims to have Truth and secret mystical knowledge unlocking the secrets of the Universe it is THEM you end up serving as your authority. It seems inescapable. So, why not just rely on your rational mind, instead?
Let's parse that, shall we?
Here are the only possibilities I can reckon.
1.There really is a true christianity but it has been lost because God did not see fit to preserve it; that was man's job and man flunked!
2.There never was a true christianity. It was a Messiah cult that got very lucky in finding a champion who had temporal athority. (Constantine).
3.Judaism was the True religion, but, they rejected their Messiah. Now each man does what is right in his own eyes.
4.God exists and expects people with the right heart and mind to seek Him no matter what. But, RELIGION always steals both their heart and mind.
5.The entire idea of invisible supernatural entities who struggle in the heavens is nonsense. Especially because man's most primitive instincts were to invent them.
6.Being moral and knowing good is a practical matter removed from Divine dictates. Who would ever think lying, stealing and cheating was okay?
7.Man's fear of aging and death forces him to create fairytale rescue scenarios. It is too suspicious that just exactly what man most wants just happens to be God's plan; Everlasting life, perfection, blessing, happiness and absolute knowledge of truth.