There's a deeper problem with comparing EW both with NI and Scotland. The questions are different as between EW and the others, which use the word "body" and then have tickboxes for individual denominations. I would argue that in NI/S this concentrates people's minds to think of their actual involvement, whereas in EW it is easy to tick Christian in an unthinking way. Hence the apparent proportion stating No Religion is far higher in S at 37.5% (excluding 5 "ethnic" religions which skew the figures) than E at 26.8%. But is this a real difference in religiosity?
Having asked this, E and W are comparable and the figure for W is much higher at 32.7%. At LA level there is huge variation, from 44.2% down to only 12.7%.
NI gives religion by country of birth. While both E and W show NR %s very close to those above, in the case of S-born the % in NI is 26.3, or 11 points lower than in the birth country. Why should S stand out so much?