To claim that being male is a genuine occupational requirement for a church pastor surely does not constitute a justifiable use of Art 10. Maybe the @EqualityCommNI has previous experience of dealing with churches who try to exclude women from job opportunities & could comment.
To expand, obviously there are other churches that don't let women be ministers or priests but usually the barrier is at the ordination stage. If a religious institution doesn't train & ordain women for those roles they're automatically excluded.
This is different because an independent church with no formal ordination/qualification structure has advertised a job on the open market making a questionable claim that only men can apply based on their 'doctrinal position', meaning their interpretation of sections of the Bible
If a Christian woman with all the necessary leadership experience applied for this post I imagine she'd have a strong case for challenging the use of Art 10 of the Sex Discrimination Order. (And the support of a heck of a lot of other Christian women and men!)