Genesis 1:26
I guess I should have said scripture that supports such a position. Using Genesis 1:26 to support it is like using John 14:2 to say that there are many mansions, when that is a grossly broad interpretation of scripture, much as translating me saying I’ll pick you up after work in my car, being translated “Cuban leaf is going to pick me up in a “limo” without knowledge of what kind of car I own.
It’s wishful thinking.
We are created in God’s image and likeness. What that really means regarding what God looks like and how eternal we are is definitely up for speculation. One could even argue that we “were” created eternal until Adama and Eve ate of the apple, and it takes the blood of Christ to get it back - blood that is not available to those that die in their sin.
As far as the mansions you mentioned regarding John 14--Jesus regularly referenced souls and people as buildings ("Tear down this temple and I will rebuild it in three days"). That passage means (to me) that we, as believers are the mansions, with our eternal, perfect bodies, living within God. There are many mansions in my Father's House.