Freedom of Religion and Belief.
https://www.citizensadvice.org.uk/law-and-courts/civil-rights/human-rights/what-rights-are-protected-under-the-human-rights-act/your-right-to-freedom-of-religion-and-belief/
Ha ha. I'm sorry for being pedantic but that was part of the original defence, that it was an objection to a political slogan, rather than discrimination.
Exactly. The bakery hasn't discriminated against Mr Lee, and have made other cakes for him.
The Equalities Commission wasted £250K of public money in fighting it.