"The more a religious teaching fails to be actualized in the...

"The more a religious teaching fails to be actualized in the being of people, the louder their claims that a returning Messiah/Al-Mahdi/post death Justice will eventually overcome their disappointment at the ills of Mankind."

A dwindling number of people as relegion continues to decline and less vocal as it says in the Qur'an there may be a time when you have to deny you are religious.

As for death we don't know when, pre WW3, during or after during the reign of the anti-christ/dajjal - 42 months /3.5 years anti-religion reign.

Justice on Judgement/Recompense Day after we all die, yes we don't know whether we will be saved, but we believe some will be. What's the harm if some of us try to change our "ills of mankind" as you term, we die happy that we tried to change and not scared of death when it's our time.