I sometimes still feel angry if someone criticizes Universal Salvation, and/or promotes Eternal Damnation. Which got me to thinking that there is something that goes beyond ideology. However, I have found that most spiritual traditions acknowledge that ultimate truth transcends ideology. In the Eastern Orthodox Churches, they don't see Dogma as a list of facts that must be believed, but a living ineffable experience. Even that does not always happen in practice.
On the ideological ground, Universal Salvation can rest on A) Bible verses, B) Bible based reasoning, C) Moralism, and D) The Scientific Method
A. With Bible Verses, we have many verses that make a clear indication that all will be saved at some point. Though some hold to different theories, like the ever open gate, or the preset age of redemption. Judgment in the bible is meant as a means to teach righteousness.
B. With Bible based reasoning, there is 1) God is all powerful and all loving as the bible asserts, and therefore claim that God will save everyone, 2) God is greater than Adam and the Devil, and Grace is greater than sin, even though sin, satan and Adam all had a powerful curse, 3) Fire torture to Baal was strongly condemned, 4) The Old Testament has no mention of Hell, 5) In the Old Testament, God forbid learning the Pagan ways, and the pagans had horrifying images of Hell, 6) The early Greek Fathers believed in UR, and only the latins who did not know Greek or Semitic society believed in Eternal Damnation, 7) The early Church from the beginning believed in UR, and gave no indication of ET until Tertullian, 8) ET only got any grounds not from scripture scholars but those educated in Roman Law, 9) People who strongly believe in ET dont live very Christlike lives, or keep his commands, and behave more like pharisees.
C. With Moralism, we have an exultation of moral principles, and apply them to divinity. We have 1) Social ethics against discrimination, judgment, torture, 2) The view that punishment should not be excessive, or should not be used solely for retribution, 3) In Political ethics, Eternal Damnation resembles fascism, or lawless anarchy where the strong rule.
D. With Science, we can observe an intelligently designed universe designed by a good God, who provides for people regardless of their misdeeds. Quantum Mechanics and other modern sciences give an indication that everything is inter-connected and that consciousness is the ground of all being. Then NDE's and other supernatural investigations give no image of Hell, but typically point to something that is not stern and wrathful.re
However, all these premises can be challenged, and there is no true certainty in any ideologies, or any proof that these ideologies are any better. Which got me into wondering if our true knowledge of God utterly transcends the mind. And even that Universal Salvation is something beyond what we can truly comprehend.