Lets take a look at how the "Religious Vote" compares 2004 vs 2000.
Exit poll question: "Do you attend religious services more than weekly, weekly, monthly, seldom, or never?"
2004 More Than Weekly (16% of total voter ID): Bush 64% Kerry 35%
2000 More Than Weekly (14% of total voter ID): Bush 63% Gore 36%
2004 Weekly (26% of total voter ID): Bush 58% Kerry 41%
2000 Weekly (28% of total voter ID): Bush 57% Gore 40%
2004 Monthly (14% of total voter ID) Bush 50% Kerry 49%
2000 Monthly (14% of total voter ID) Bush 46% Gore 51%
2004 Seldom (28% of total voter ID) Bush 45% Kerry 54%
2000 Seldom (28% of total voter ID) Bush 42% Gore 51%
2004 Never (15% of total voter ID) Bush 36% Kerry 62%
2000 Never (14% of total voter ID) Bush 32% Gore 61%
2004 Weekly or more frequently (42% of total voter ID): Bush Avg 61% Kerry 38%
2000 Weekly or more frequently (42% of total voter ID) : Bush Avg 60% Gore Avg 38%
2004 Monthly or less frequently (57% of total voter ID): Bush Avg 43.8% Kerry Avg 55.0%
2000 Monthly or less frequently (56% of total voter ID): Bush Avg 40% Gore Avg 54.3%
So, among the most frequent of church goers, there was insignificant change 2004 over 2000 for either candidate, while among less frequent attendees, Bush gained 3.8 percentage points, or nearly 10% share 2004 over 2000, while Kerry gained only 0.7 percentage points, or a bit less than 1.3% share compared to Gore. Clearly, there was no "Religious Zealot" boost for Bush; Kerry merely underperformed in this particular demographic. Nothin' special there; he had a lot of that goin' on across the board. That's why he lost.
Unrelated, but rather interesting none the less: 83% of those surveyed said they had voted in 2000. This election, Bush got the votes of 10% of the former Gore voters, Kerry got 90%. Those who had voted for Bush in 2000 broke 91% to 9% for Bush this time. To all practical purposes, the 2 samples exhibit a statistically insignificant difference, leading to no other conclusion than that new voters favored Bush this time around.
Data:
CNN Election 2004,
CNN Election 2000