Here's some interesting thoughts on the nature of "inception" from the film and Jonathan Edward's work The Freedom of the Will. Read the whole article.
Following this notion then, “inception” is something that is planted in us at a deep level and radically adjusts our inclinations at a level we scarcely fathom. Similar to the inception in Nolan’s film, a Christian concept of regeneration… the effectual calling of God’s Holy Spirit on our will… does not force us to ‘think about elephants’” (as Cobb refers to in the film). It (the gospel) introduces a radical, transforming idea in the mind (and heart). Just like the character of Robert Fischer in the film, who would never DREAM of something so ludicrous as to “split up my entire inheritance”, we – as fallen, sinful humans – do not incline ourselves to God unless such an idea is given to us, (planted, like a seed from a Sower) and grows inside us, through every facet of our frame, even at the subconscious level.