Separation can only happen it there is something wrong with the source of the religion and the bible has been question of originality. In Islam we don't have that because separation is a sin for a ruler (if you a ruler of a country and Muslim but separate God and country ) but this sin only applied to a ruler or government who believe in Islam.
I’d counter that these laws from Judaism, Christianity and Islam were written when life was harsh and its laws reflected that. We have evolved as a species and as such the laws have largely changed since 1500+ years ago. I’m just gonna say if people of your faith believe saying words equals death, or chopping off heads is even considered as a punishment, then maybe you need some type of reform.
Our faith and belief doesn’t change. How we conduct ourselves as people should however adapt with the times.