Fundamentalist Christians thought that the world needed to be taught that their religion was the only way, and imposed it by force on those that would not believe.
Muslims and undoubtedly other religions still do this in some places where they can get away with it.
In my opinion and hopefully somebody agrees with me, this attitude is no way to act in modern times.
(I note that there could have been some positives with regard to forming strong societies in the past but that’s not my point.)

My question is, why do sensible well educated atheists continue to attempt convert people away from their religion altogether?
Rather than promoting integration and moderation.
This would have the effect so often wished for by many atheists of reducing the amount of religious interference in their lives.
Even to the simplest of minds (i.e. mine) this has to be a more realistic approach.
Heads brick walls and all that.
Ps. I interpret fundamentalist, as the belief that one holds the sole source of objective truth.