In recent years there has been an upsurge of interest in religion among economists, but the content of religion has so far been neglected. This paper builds a rational choice model of divine action, in particular of the structure of the divine offer of salvation and rational human response. It considers why God might not save everyone, the pattern of salvation across individuals with different preferences and endowments, and the way religious conversion and revivals are often large and sudden changes. Rational choice analysis of divine human interactions is a contribution to the renewal interdisciplinary conversation between economists and religion scholars. [Editors Note: This article is the first part of a conversation which is continued in the article entitled Conversation on Paul Oslingtons Deus Economicus in this same issue of AEJT: [http://aejt.com.au/2009/issue_13] http://aejt.com.au/2009/issue_13.]