Religious symbols and Facebook Posts?

Just wondering what people’s views would be about tenants in a shared house (all on individual room contracts) putting religious symbols in communal areas?

The religious symbols in question being Catholic symbols. No-one has complained about this (except someone viewing the property who asked lots of questions about them, and clearly was very uncomfortable with them and not keen on taking a room as a result). However, one of the people responsible has been complaining about Facebook posts reposted by one of the other housemates, the posts in question referring to the Northern Irish conflict (and whilst they were clearly not supportive of the IRA no personal comment was added by the housemate in question, and he has previously served in Northern Ireland in the military and the posts seemed to be linked to an anniversary of soldiers having been attacked by the IRA).

This is a snippet of a much larger scenario, with many points being put forward by both sides. Ironically the pre-existing tenants were invited to approve the newer tenant (the ex-military one), and they were supportive of his moving in. It has however not been a successful composition of a household, and I’m actively trying to find alternative accommodation for the newer tenant, to save everyone’s sanity, not least mine.

However, I’d like to better understand:
I understand that it’s illegal to harass others, for example because of their race, ethnic or national origin, religious beliefs etc. However, I also understand that EU Protection of Human Rights provides for ‘Freedom of thought, conscience and religion’ and it seems to me – trying to look at this objectively – that a post on someone’s Facebook page (which others don’t have to look at) is arguably less invasive than effectively forcing others to live with religious symbols (which they may associate with a stressful period that they’ve previously experienced).

I’d be interested to know what others would do faced with these same issues?
I don’t believe that I’m being asked to get the Facebook page changed – but it is being held up as an example of why the poster is an unsuitable housemate (despite the others being fully aware of his army connections right from the start). Also, no-one has asked that I take any action regarding the religious symbology (which I personally don’t mind, but am concerned that it is intimidating for others in this shared house environment – I’m also concerned that it has only been in place since the newer housemate has moved in, despite the others having rented from me for more than two years).

Many thanks

Julie