*Today 12:47 BettyDuMonde
Not necessarily - religious beliefs and gender reassignment are both equal under the equality act, but there is a provision for exemptions based on biological sex. Thus it would be transwomen that would have to move over, not religious women.*
The OP is asking what will happen if self-ID is introduced. If it is, trans women's freedom to attend events for women will be protected by law. There may still be exemptions, but I'm assuming OP wants a discussion about what happens if there aren't.
Also - religious beliefs are not enshrined in law. Religious freedom is. These are two very different things. Religious people are not entitled to have their beliefs enforced by law. Hence those who believe homosexuality is wrong not being allowed to discriminate against gay people. If you have a religious belief that is not supported by a corresponding law, you cannot expect that belief to be enforced. So if the law states that trans women are allowed to attend women only events, and your religious beliefs are incompatible with that law, you are the one who has to be accommodating.
but as has been pointed out further up, lots of other women like female-only sessions too - some women just prefer women-only sessions, others attend because of previous abuse etc.
I'm sure this is true. But this isn't unique to this scenario. Women might have PTSD or feel anxiety over many things that can't be accommodated in law. You can't ban black people from gyms because someone was assaulted by a black person once and now feels anxiety about them, however real that anxiety is. A balance must be struck. It would be disproportionate and discriminatory to ban all black people from a particular place because of the discomfort of another person in the presence of black people. Similarly it would be disproportionate to ban all trans women from a particular place because of the discomfort of another person in their presence.
There's no perfect solution here - just a constantly shifting balance of rights and preferences and beliefs and laws that don't always harmonise. There's always going to be 'what about...' scenarios like the one posed by OP because part of the enormous diversity of humankind necessarily involves clashes sometimes. We're always learning how to navigate those.