Confessionalism is an ideology that varies per country it's practiced in, being either economically centrist and culturally right-wing in the 
Netherlands, or just a layer of bureaucracy in states like 
Israel or 
Lebanon. Typically confessionalism means "representation of religion in politics". It typically entails distributing political and institutional power proportionally among confessional communities.
History
Iraq
After the American invasion of Iraq a system was established, although not official but traditional, that required power to be shared between the main three ethnoreligious groups of Iraq: Sunni Arabs, Shi'ite Arabs and Kurds, with the President being a Kurd, Speaker of Parliament being a Sunni Arab and the Prime-Minister a Shi'ite Arab.
Israel
Among other limitations, political parties cannot deny that "Israel is a state of the Jewish people".
Lebanon
The seats of the parliament are split in two, half are for Christians: 34 for Maronite, 14 for Eastern Orthodox, 5 for Armenian Orthodox, 8 for Melkite Catholics, 1 for Protestants, and 1 for other Christian minorities (and Jews theoretically, although none have ever tried to compete for it), and the other half is split between Muslims and Druze (the Lebanese state considers Druze to be Muslims despite the majority of Druze people not defining as Muslims and their religion being fundamentally unislamic), they are as follows: 27 for Sunni Muslims, 27 for Shi'ite Muslims, 2 for Alawite Muslims, and 8 for Druze.
Additionally, the National Pact, and after the civil war, the Taif agreement stipulates that the President must always be a Maronite Christian, the Prime minister always a Sunni, the speaker of parliament always a Shia, the deputy speaker of parliament and deputy prime minister Greek Orthodox and the Chief of the General staff of the Armed forces always a Druze.
Although it was supposed to be a temporary solution meant to ease sectarian tensions and create cohabitation between the different sects and their vision for Lebanon, "until such time as the Chamber enacts new electoral laws on a non-confessional basis", more than eighty years later, confessionalism remains the system of government implemented in Lebanon, much to the dismay of a big portion of the local population, and despite growing protests calling for its removal.
The Netherlands
In the Netherlands confessional parties generally adopt a economically centrist and culturally right-wing program to base their politics on, that program being influenced by the bible. The term was coined to mark the effective fuse of catholic and protestant ideologies into one ideology. Old confessional parties have later adopted 
Christian Democracy instead.
How to Draw
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Relationships
Friends
Christian Democracy - Good job at representing religious interests in politics!
Islamic Democracy and Zionism - Same as above.
Religious Nationalism - Congratulations for your national defence of religion!
Cultural Christianity - Best non-religious guy!
Fascism - Great son of cultural Christianity.
Frenemies
Theocracy - That's a bit too much, don't you think?
Secularism - I know you oppose religious influence in government, but thanks for allowing religious people to publicly express themselves.
Conservatism - Sure, most of you are religious, but for some reason you also seem to attract a lot of atheists who hate me.
Enemies
State Atheism - Stop criminalizing religious people, damnit!
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