(In answer to question what evidence is there for the claim that we all need to be saved and that Jesus is a the saviour)

The evidence is alienation inclusive of any non acted out nastiness in one's mind.
That things are not going as well as they could be although as far agnostic and atheists that is usually down to other people (Don't forget that all people are included in somebody's other people).
If you look at other religions they are commandment following, scales of justice or technique based.

What evidence do you have that there is no alienation, that it is down to people and that law-following or techniques can actually save or whether only God can take it upon himself.