As long as a country is a voting country, separation of Church and State is impossible.
This is not necessarily the case.
It purely depends upon the structure of the state's Constitution and the willingness of the people to adhere to that Constitution.
The problem is when the government begins to over-run its Constitutionally established powers and special interest groups flock to government lobbies to ensure that their viewpoint is heard.
The government shouldn't have any role in healthcare. Therefor the issue of abortion is moot. Because we have allowed unconstitutional, treasonous behavior in our nation - we have people using religious arguments to try and see to it that things are done their way in the government. Any reasonable society would realize that it is dysfunctional to attempt to determine where life begins in the womb and apply that distinction through law. The only outcome of such practice is a revolt and collapse of the system.
But, we also allow people receiving government aid to vote. That is a direct conflict of interest and should never happen.
This is all, essentially, a postmortem on the U.S. - which is already a flaming train wreck screaming over a cliff. We're still convinced that zero-gravity is a magical power of the conductor and that the fire won't burn us. The ground at the end of our descent hasn't even entered into consideration.