Oh, nooooo - not that thing. I despised that movie, I have to say - stories about the eeeevil Catholic church suppressing some revelatory theological truth get really old after a while. Fortunately, my wife restrained me from pulling an Elvis and shooting out the picture tube on the TV ;)
Generally, it did not "ring true" in my Spirit as I read through it - as the Gospels of John, Matthew, Mark and Luke do.
That doesn't surprise me. As the Thomas FAQ suggests, the perspective of the text is a sort of lite-beer version of gnosticism - basically, that the Kingdom of Heaven is all around us, if only we can open our eyes to it, and not in some otherworldly place. An interesting perspective, to be sure, but not exactly orthodox.
I just finished the Apocalype of Adam. I recognized it, as I did the gospel of Thomas. So I went to the Pseudepigrapha texts, and sure enough, that is where I first read it!
I'm not familiar with that collection. Sigh - I really need more reading time, but there's very little chance of that in the near future ;)
Yours is an example. As I mentioned at 2177, I see the firmament as the separation between the spiritual realm and physical realm and not a geometric boundary (space/time.) Hence, I find myself largely in agreement with that statement as Spiritual truth, that the spiritual realm is co-existent.
I do not however see the Kingdom of God as arrived - the Lord's Prayer and the book of Revelation, etc. indicate that all that is not the name of God (person, character, etc.) must be culled before His Kingdom comes.
I do hope you get a chance to read the Pseudepigrapha. Its in two volumes, edited by Charlesworth. With each ancient text, they go through language, history, provenance, theological importance, relationship to canonical books and apocryphal books and so much more.