Sidelizio entered the Society of Jesus on 12 April 2003 in the Loyola Novitiate, Singapore.

After two years of novitiate formation he went to do his juniorate program for one year at Arrupe International Residence in Manila, Philippines.

He was transferred to Jesuit Theological College to complete his Philosophy studies after studying Philosophy at the Ateneo de Manila University for five semesters as an undergraduate student.

Sidelizio is now doing his Bachelor of Theology, majoring in Philosophy.