As
angrysoba said (and supported by citing Wikipedia), the three oldest states in the US are Maine, New Hampshire, and Vermont.
Maine is the whitest state in the United States. Vermont and New Hampshire are the 3rd and 4th whitest.
So if you're talking about "old white people", you're talking about Maine, Vermont, and New Hampshire.
But Vermont, New Hampshire, and Maine are the least religious, 2nd least religious, and 7th least religious states in the US.
If logic were on topic in this thread, we'd say those three states are counterexamples to the idea of "old white people being religious".