I agree that there is no formula.
I do believe that Christian churches have "invented" a formula.
That formula would be that one accepts Christ and is saved forever.
As to why I ask about being brain-washed...
When I was a new Christian I had been taught that only through Jesus can we be saved.
I soon realized how silly this concept is to an all-powerful being such as God.
My Christian friends however (not all of them) kept insisting that if one had never heard of Jesus, they could not possibly be saved.
I've come to deny this belief because God is not so small...
It is our thinking that is.
By our, I mean anyone who teaches this, including some pastors of churches.
Formula - what do we mean? A chemical formula is the structure of a molecule. A mathematical formula shows how different mathematical ingredients work together.
In theology the trinity is a Formula of Gods presence in the world.
The cross is a formula for reconciliation.
Repentance and walking in faith is a formula for communion.
Meeting Jesus has all these aspects, which all interact in an infinite combination of ways.
Reductionism is the attempt to reduce complex systems down to definable relationships which can be simply expressed.
Jesus brought us the bible, a mass of human experiences with God, which all have wisdom and meaning, context, good and bad points. The sacraments view of faith, attendance at church, reading and praying through scripture can become formula's. I was singing praises in church this morning, doing the projector, and thinking I had done this so long, I had lost some meaning in the words that my heart truly sang to the Lord. So I sung them to the Lord.
If it becomes a formula it seems to lose the life and the Spirit. Love ebbs and flows, gets hurt, adjusts, reappraises and then moves forward. The Lord got furious, which was tempered by Moses and Aaron, yet out view of the Lord is He is unaffected gliding above, distant. My heart broke in thanks to Jesus the other day when I felt the Lord appreciating my love for Him. He is so humble, that which I offer He values. I do not know how we are like Jesus and the Father, but I do know his way is as a Father and balancing all the responsibilities with support and encouragement.
Elijah was hopeful of Ahab coming round, but in the end Jezebel went after him so he ran. The Lord took this tired and in some ways broken man and encouraged him once again. The Lord chooses this walk time and again, and brings in people to the Kingdom.
So there is a formula in one way but not another. I have come to see that is the problem with trying to be too definitive, the Lord uses everything.
God bless you