Is there any core feature of christianity not found in other religions

[Drich]

Freedom from any law or list of rules as a means to righteousness.

Personal relationship with God for every member

To be welcomed as apart of the Father's house hold one day.

I would say those where the big three. I know may of you believe many if not all other religions share these qualities, but if you were to honestly look you would note they don't.

Freedom from any law or list of rules as a means to righteousness
I already granted that.

Personal relationship with God for every member
Wrong, All muslims who are righteous are promised a relationship with god in the after life and many hindu's cherish their personal relationsips with a god or multiple gods. We see that in many pagan religions as well. And rastafarians.

To be welcomed as apart of the Father's house hold one day.
If you mean heaven then, that was borrowed straight from zoroasterianism. Also featured in islam.

You asking for religious distinctives which means here and now, Not 'one day'. As such Christianity offers a directly relationship with God now, and not after he proves himself to be a devoted follower of a given religion.

What pagan religions? And Rastafarians don't even believe in an after life.

Muslims in the afterlife go to paradise where they will experience untold spiritual and physical pleasure. They are not welcomed as members of God's house hold.

Zoroasterians don't even believe in a physical heaven or hell..
http://www.heritageinstitute.com/zoroastrianism/death/

My three points stand.