I would like to know if all of mainstream Christianity beleive the same requirements for salvation.
There is no "mainstream." Christianity is pure, exceptional, its roots and pathway solidly and straightforwardly laid out in Scripture.
I think what some people consider to be "mainstream" is the bigger and organized groups. And joining a group because of their ideas and practices can have the risk of doing a copy-cat culture thing.
In Ephesians 1:12 we have that "we" Christians "first trusted in Christ". And in the scriptures we have plenty about what is involved in trusting in Jesus and what comes as the result. One thing I think of, which does not seem to get much attention, is Hebrews 12:4-11 about how we need to actively seek our Father for His correction, and the results of how God corrects us.
I would also like to know how others who do not believe in Christianity's version of salvation then do you beleive that there is a salvation from the dead.
Christianity's version of eternal salvation is the only applicable version.
amen
The concept of "Salvation from the dead" is to me rather strange in that death itself can be a kind of liberation from the limitations of this life.
I would say Jesus has told us that dying can bring us to better than all we have in this life
However, in order to go on to better, after we leave this life, we need for Jesus to save us, first, in this world. Among other things, we need to be turned "from the power of Satan to God" > see Acts 26:18 > also, please consider Hebrews 2:14-15 with 1 John 4:18.
I can't conceptualize what I would need to be saved from, based on my experience of the world in my life.
saved from God's wrath,
saved from our sins,
saved from being slaves of Satan's power which includes how lusts for pleasure can be dominating and dictatorial and nasty reacting about not getting those pleasures,
and saved, then, from our own human nature which makes us available to Satan's power of lust and nasty reacting and then deeply suffering torment
We all qualify for the welfare of God's mercy
But let's say that you do have some compelling proof; I'm not really sure what I think of a God who is so readily excited to condemn most of the souls he created for not believing very specific things about him. It just doesn't jive with what seems like an eternal being.
In case you got this impression of God from talking with people and reading the Bible, I would say go back and see what you get now from the Bible. There is much more and better than what you have shown, here, that you have gotten. And if you talk with Christians, I know they will tell you a lot more than only that God does judge.
Death isn't the "enemy"..something to be feared or to be repulsed by.
Well, there is dying which means leaving this world. This does not have to be our enemy. But the deeper spiritual and emotional deadness of sin is a major problem . . . but not to be feared, but overcome through Jesus.
In the same way all whole look towards Christ on the cross for their salvation ( beleiving in Him) will be saved.
amen