For Jehovah's Witnesses specifically, this could not be further from the truth [0], and for Christian groups generally, you beg the question here by ceding one must believe in that religion's concept of a deity/afterlife/etc. Such a belief is extremely hard to come by if not raised in that religion, and even harder if you're attached to reality's cause-effect relationships. Not impossible! But hard.
And you're right; warring religious groups don't use fists...
This is a stupidly glib comment. The poster meant that the reality of life as a Jehova's Witness cannot be gleaned from looking at some document of the religion, and I think you knew that, but decided to take a shot at the Bible anyways because you've been acculturated to think that dunking on religion is both correct and acceptable.
And you're right; warring religious groups don't use fists...
[0] https://en.wikipedia.org/wiki/Jehovah%27s_Witnesses_congrega...