Aggressive secularism - a timeline

1829 - Catholics emancipated
1836 - non-Anglicans allowed to marry in England and Wales
1836 - tithes made monetary payments rather than goods in England and Wales
1838 - more people allowed to affirm instead of take an oath in court.
1868 - abolition of compulsory church rates (i.e. taxation powers of parish churches)
1871 - Catholics allowed to use the title 'Bishop of X'.
1871 - disestablishment of the Anglican Church of Ireland
1871 - non-Anglicans allowed at Universities of Oxford, Cambridge and Durham.
1888 - atheists allowed to sit as MPs
1920 - disestablishment of the Anglican Church in Wales
1977 - last remnants of tithes abolished (apart from chancel repair liability)
2001 - clergy allowed to become MPs
2006 - sixth-formers allowed to opt out of school prayer
2008 - offences of blasphemy and blasphemous libel abolished in England and Wales
2013 - extinguishment of unregistered chancel repair liability
???? - civil partnerships allowed to be conducted on religious premises

???? - removal of Anglican Bishops from the House of Lords
???? - removal of state funding from faith schools
???? - removal of Canterbury's degree-awarding powers

I'm not sure whether to include tithes. I'd added a couple of tithe-related things, but at some point it seems tithes got turned into what was basically groundrent.

Meanwhile, in the rest of the world

1787 - Article Six of the US Constitution prohibits religious tests;

1791 - First Amendment to the US Constitution ("Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof") passed

1905 - Full separation of Church and State in France

1920s - Introduction of secularism in Turkey, with wide-ranging effects including the banning of certain types of hats.

1929 - Catholic Church accepts loss of sovereignty over a large portion of central Italy including Rome.