Era I: Baptism was formed by vocalist, guitarist, and songwriter Lord Sargofagian and Demoniun on drums in the Finnish town of Ylöjärvi in 1998.
As early as the summer of the same year, the first and now extremely rare demo 'Satanic Rituals' was released. A second demo entitled 'Sons of Ruin & Terror' followed in the year 2000. The band was joined by Slaughterer on bass in 2001 and this line-up unleashed first full-length 'The Beherial Midnight' (2002), as well as sophomore album 'Wisdom & Hate' (2003). Afterwards, Lord Sargofagian relocated his centre of activity to Kuopio and his former allies left the band.

Era II: Baptism quickly reformed in Kuopio, when Lord Sargofagian met Spellgoth and SG.7 joined the band before taking on duties as live guitarist and singing clean vocals. The EP 'Black Ceremony' as well as a split 7" with Uncreation's Dawn followed in 2004.
More live appearances materialised in their home country after the release of a third full-length entitled 'Morbid Wings of Sathanas' (2005). On the following EP 'Evil Mysteries' (2006), Lord Sargofagian was responsible for playing all instruments.

Era III: Baptism experienced another change of line-up when their mastermind returned to western Finland by moving to Tampere. Cinatas handed his duties over to M, who became the band's third bassist. The black metal outfit began to perform internationally in 2007. LRH became session drummer for the next album 'Grim Arts Of Melancholy' (2008), while TG took over as lead guitarist from SDS. The EP 'Chalice of Death' (2010) was recorded and released amidst rituals all over Europe and led to a mini tour in Russia. In the meantime Syphon became the fourth bass player for the Finns.

Era IV: Baptism unleashed their next full-length 'As the Darkness Enters' in 2012.

Era V: Baptism sign a new record deal with Season of Mist and release a new album.