@Thomas,
Thomas wrote:it will inevitably instill in them a sense that they have wasted whatever parts of their lives they had invested in their religion.
Quote:But when you write a book presenting a case against the existence of god, forcefully and in clear language, you inevitably offend a large number of believers.
Come on Thomas. These are two completely different statements.
The first statement you are claiming that when an Atheist persuades a believer, the believer will be upset because they will regret the "waste" of their life to religion.
The second statement is claiming that a clear and direct case against the existence of God will offend believers. Presumably in this case the believers, being offended, are not being persuaded. In any case, here you are not specifying the reasoned for the presumed offense, nor are you addressing the fact that Dawkins has offended non-believers.
I may be wrong, but my impression is that you are still assuming that Dawkin's argument is somehow superior to that of a generic "believer".
I would point out that there are atheists who are offended by Josh McDowell (who writes books such as "Evidence that Demands a Verdict" that believers claim prove the existence of God). Of course, neither your argument or this counter argument prove a thing.