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I'd venture to guess that there is no real difference between number of Catholics and Protestants who go to church every Sunday and who voted for Obama and the Catholics and Protestants who rarely go to Church who voted for Obama. It's about 50/50.

Wrong, unfortunately. There's a correlation between frequency of attendance and conservatism. While not the whole voting chart, here's the relevant subset:

65% McCain, xx% Obama - Weekly church-attending Protestants⁷
55% McCain, 43% Obama - Weekly mass-attending Catholics ^6,9
54% McCain, 44% Obama - Weekly church-goers^1,4,7,12
54% McCain, 45% Obama - Protestants^6,8
52% McCain, 47% Obama - White "regular-mass-attending" Catholics¹²
46% McCain, 52% Obama - Non-Evangelical Protestants ¹²
xx% McCain, 53% Obama - Monthly church-goers ⁴**
45% McCain, 54% Obama - Catholics^{1,4,6,8,9,10,11,12}
xx% McCain, 59% Obama - Semi-annual church-goers⁴**
38% McCain, 61% Obama - Occasional churchgoers¹
37% McCain, 61% Obama - Non-weekly-mass-attending Catholics^6,12
xx% McCain, 68% Obama - Don't attend church⁴ **
23% McCain, 75% Obama - Unaffliliated with any religion¹¹

65% McCain, xx% Obama - Weekly church-attending Protestants7

I am assuming this figure includes Blacks and Hispanics, bringing the 75% figure for White protestants as a sub group down to 65% for all Protestants. I'm figuring the Hispanic figure doesn't impact the Protestant % as much as Blacks because more of them are Roman Catholic.