Forcing anyone to do or not do something will accomplish nothing but make the enforcer fall within the same tyrannical structure that the world's organized religions display.
Communist/leftist countries have tried, for almost a century now, to eliminate religion from it's lands. Although they have succeeded to certain extents in doing so, I doubt you would hardly find those places to be the utopias of the planet. Reason being is that ultimately, we must respect human conscience.
For whatever reason one might believe, whether through evolutionary process or because there is indeed a God that created us that way, we humans have displayed an innate necessity for spirituality, a need to connect to a greater good, usually done through worship of our believed deity. We cannot eliminate this through mandate. History has proven it.
Patience and love is key, not Tyranny.