Who is Tovia Singer?Tovia Singer (born 1960) is a Jewish rabbi. Singer is the founder and director of Outreach Judaism, Indonesia.
What is Unitarian?Unitarianism can be viewed as a form of Nontrinitarianism which is a form of Christianity that rejects the mainstream Christian doctrine of the Trinity. The teaching that God is three distinct hypostases or persons who are coeternal, coequal, and indivisibly united in one being, or essence (from the Greek ousia). Certain religious groups that emerged during the Protestant Reformation have historically been known as antitrinitarian, but are not considered Protestant in popular discourse due to their nontrinitarian nature. According to churches that consider the decisions of ecumenical councils final, Trinitarianism was definitively declared to be Christian doctrine at the 4th-century ecumenical councils, that of the First Council of Nicaea (325 AD), which declared the full divinity of the Son, and the First Council of Constantinople (381 AD), which declared the divinity of the Holy Spirit. In terms of number of adherents, nontrinitarian denominations comprise a minority of modern Christianity. The largest nontrinitarian Christian denominations are The Church of Jesus Christ of Latter-day Saints ("Mormons") and Jehovah's Witnesses.
Who is the Messiah?In Abrahamic religions, the messiah or messias is a saviour or liberator of a group of people.
What is Sin?In Abrahamic contexts, sin is the act of violating God's will. Sin can also be viewed as anything that violates the ideal relationship between an individual and God; or as any diversion from the ideal order for human living. To sin has been defined as "to miss the mark".
Sins fall in a spectrum from minor errors to deadly misdeeds. Catholicism regards the least corrupt sins as venial sins which are part of human living and carry immediate consequences on earth, and, if unrepented for, more painful purgation, assuming the person is destined to heaven, as it is written in the formation letter "Purgatory", "most of the early Fathers of the Church speak of a cleansing fire, though we cannot tell whether this means actual or spiritual fire."
Conversely, sins of great evil are mortal sins which bring the consequence of hell if they are not addressed either through an act of perfect contrition or going to confession about them.