Religiosity is of course highly related to partisanship. Highly religious Americans tend to skew Republican, while unreligious Americans tend to skew Democratic. Thus, we would expect that a good deal of the reason for the religion gap in presidential approval is directly related to these party factors. And that certainly appears to be the case.
When we isolate just Republicans, the religiosity effect for Trump disappears: 89% of highly religious Republicans approve of the job Trump is doing, compared with 87% of those who are moderately religious and 86% who are not religious. Among Democrats, approval is only four points different between those who are highly religious (11%) and those who are unreligious (7%).
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