Hmm since you replied...
You study Greek? Since you wrote 'Look to the Greek for the meaning of Romans 8' why don't you break it down to prove your point, using the Greek? Prove your point that 'the Spirit of Christ gets the heart ready for the Holy Spirit and then leaves' - I paraphrase what you wrote before.
You posited this scripture for your position in the first place. It is up to you to prove your point from it...otherwise you should not have brought it up in the first place.
Perhaps in the future, you will think twice...
Oh, Trinity isn't three? Then why is it called Trinity? Do you know what that means? And what exactly is your argument then? Lol so many Trinitarians don't even know their own beliefs that they blindly state, but when it gets down to the truth, they backtrack and say God isn't three persons that are not each other. Do you know what your own beliefs are?
The same offer is made to you...bring forth any Biblical verse which you feel somehow thwarts the Trinity, and detail to us why that you think that it does.
This way you can prove to us that you comprehend what the Trinity even is.
Good luck...