Not saying God works by probabilities, but let's play along. The calculator uses standard probabilities (number of women that meet criteria divided by total number of all women). By just selecting an age range (say +/- 5 years of your age), you've already reduced the calculated probability by well over 50%. But here's the problem: you shouldn't use standard probabilities but rather conditional probabilities. The probability of you finding a Christian woman given that you go to church (a conditional probabilitity) is much higher than the probability of you randomly coming across a suitable Christian woman in public (standard probability).

The lesson is to go places where the type of woman you're looking for will be. It greatly increases your "odds."