This paper proposes a mathematical model to prove the existence of God, validate God’s promises, summarize God’s plans throughout history, and predict the date of the Second Coming of Christ Jesus. For such a model to be useful, it needs to fit all (or most) available historical data, give answers to some controversial questions, and make predictions about the future. I collect the dates recorded in the Scriptures and secular literature as raw data. Using these raw dates as inputs, I build a (linear) mathematical model represented as a calendar or a timeline such that the model or fitted dates (not the raw dates) are consistent and that it satisfies the linear constraints constructed from some known or pretty-much-universally-agreed-upon dates and durations. I use some unknown key dates as the model variables to be solved. Given these variables, I show that the regression model found is unique so no other calendar, i.e., no other sets of inputs, could satisfy all the constraints. Using such a model, I can answer some interesting questions, such as the exact date of Exodus, and predict the precise date of the Second Coming. I provide the gsheet of my model so that the reader can replicate, test, modify, correct and improve my calculations.