When I was at mu Grammar school in the 70s, we were 'taught' RE by having to learn verses of the Bible for homework (I didn't know Islam existed until I was about 18
and only knew about Judaism because jesus was a Jew (even more
).
Over the years, the RE syllabus has broadened its scope as it has developed to include learning about other world religions. I can see that this is useful in historical, political and religious contexts. So, I can understand that 'RE' as it is taught now should be a valid part of the 'humanities' group.
However, how this knowledge of global religions and beliefs fits in with Jewish/Islamic/Fundamental Christian (etc) free schools is a mystery to me, and these MPs who are effectively backing a broad religious education don't seem to be on the same wavelength as certain members of the cabinet.