As times ago,the countries have either theocratic state or laic/secular state.For example,Vatican,Saudi Arabistan and İran are the theocratic state , UK-USA are the secular state but France ,Türkiye and Mexico are laic state.The communist countries (N.Kore-China-Cuba-Vietnam) are laic .
After Magna Carta( 1215), the "EVOLUTION" started in UK ,it lasted many years ,one side (the workers-the farmers-the bourgeois) and other side (King-the clergy ) signed the "Toleration act-Instrument Government-Declaration of Rights".They controls ,alltogather, the instruments of Gorvernment.
In France , The REVOLUTİON (1789) ended the autority of the King and The clergy. The social class (the workers-the farmers-the bourgeois) didn't share to control the management of the state.They are more strict about that.Therefore ,at the France Parliament and T.B.M.M , The parliamenterian don't swear by Kuran or Bible.
As for me, Laicism/Secularism is the separation of the WORLD affairs (not only state affairs) and religious affairs.
in Türkiye,AKP doesn't understand different between "the world affairs " and "the state affairs" and they say "we doesn't change the state but the world affairs must change ".We known very well , this is TAKKIYE(big religious lie).