A lot of the campaigns on its web pages are bent on destroying religious traditions
As far as I can see pretty well all of the NSS campaigns are entirely focussed on issues where religion and the state bump up against each other, which of course is entirely consistent with its secular remit.
Do they want to abolish faith schools - no, they only want state funded faith schools abolished. Do they want to outlaw admission to faith schools being on the basis of faith - nope, only when the school is funded by the state.
Do they want to stop private organisations choosing to hold prayers at their meetings - nope - they only want to outlaw prayers as part of official meetings of public bodies, e.g. councils.
Do they want hospital chaplains abolished - nope they just think that they should be funded by the religious organisation, not the state.
In fact the only campaigns I can see which aren't directly about religion and the state are where there is abuse or cruelty - e.g. religions slaughter, abuse in churches and FGM.
and I'm not talking about the House of Lords here.
What are you talking about then?