Is it (radical forgiveness) solely of Catholicism though?
No, I definitely don’t think radical forgiveness is limited to Catholicism. Nor do I think the Church or Christianity in general has always lived up to that ideal.
No. again, this was an (unspoken) doctrine prior to the split between Latin West and Greek East. It's there in the theology of the oldest Christian denominations, but has become eclipsed by those later, notably the Reformation traditions.
There are Catholic and Orthodox theologians, notably the indisputably heavyweight and influential David Bentley Hart (Orthodox) and the equally indisputably heavyweight and influential Illaria Ramelli, who write powerfully in favour of the idea of the apokatastasis – the restoration of creation to a condition of perfection (a type of Christian Universalism)
Distinction occur over the idea of the existence, or otherwise, of hell. Following Scripture and the Fathers, I would argue that Hell does exist – if even only as a potentiality – and that the duration in that state is not eternal, the suffering (all Medieval imagery aside – thank you Danté) is corrective and remedial, and does not last forever.
Indeed, as Pope-Emeritus Benedict XVI argued, that 'time' is a misnomer in the eschaton, as time is in reference to the physical domain, not the spiritual domain, and that this period of suffering could be considered momentary (yet no less painful),l taking place in a face-to-face with the Risen Jesus who strips all the illusions from the soul, bares all sin, and reaches out a hand in forgiveness – in a sense asking two things, acknowledge the truth of your own being, and acknowledge me – it is then up to us whether we accept (ie repent) the offer or not.
Again, theologically, the argument is, and must be, that God creates us free, does not coerce, and the choice is ours. Quite how then, with all error stripped away, one can still refuse to accept the offer escapes me, but we must allow for it or the idea of freedom becomes illusory.
So hell is something along the lines of the 'shewings' of Julian of Norwich – it exists, but is empty.
The apokatastasis was preached by the early Fathers, notably Clement of Alexandria, Origen and that great Trinitarian, Gregory of Nyssa, as well as, according to DBH, that other Cappadocian giant, Basil the Great.
Some universalists point towards mistranslations of the Greek word αιών (
aion – a period of time) in the Latin Vulgate as
aeternam, this latter term meaning eternal. The Greek term does not imply eternity as such.
And they created so many sins and only made forgivable through the Church confessionals.
Again, not the Catholic Church, but the Church as such in its day.
Jesus, on the other hand, preached unconditional love and forgiveness for all. To love our enemies and pray for those who persecute us as well.
Yes, but He also preached damnation ...
But there are many parts of Jesus' message that I agree with.
But for the Christian, it is necessarily all or nothing – we cannot pick-and-choose, rather we have to seek the meaning. Choice is largely determined by the
sitz im leben, the reasons why people might reject sin/hell today are often sentimental and as sociological as the reasons why sin and hell was argued as absolute.
We like to think of ourselves today as 'enlightened', but that's all part of the illusion.