The argument for a creator God from the impossibility of infinite causal chains, using a person as an example, is:

1. Suppose there is a person, John, at an arbitrary point in a causal chain, x
2. In order for the atoms that comprise John's body to be where they are at point x, there had to be forces acting on them at x - 1, which account for their current location. In order for the atoms that comprise John's body to be where they are at x - 1, there had to be forces acting on them at x - 2. And so on
3. Suppose this causal chain is infinite
4. Then, John is a product of a sequence of events represented by: x - ∞, x - (∞ - 1), x - (∞ - 2), ..., x - 1, x
5. But it is impossible to reach x from x - ∞, as no matter how many events take place after x - ∞, the infinite series will never be traversed
6. Therefore, John must be a product of a sequence of events represented by: x - n, x - (n - 1), x - (n - 2), ..., x - 1, x, where n is some finite number, or else his existence would be a logical impossibility, as his atoms never would have reached their current arrangement. And, x - n represents the point at which an uncaused, first cause, God, created the universe