I think you may be misreading this. This isn't about some person becoming a new Christian. It's about a member of high society wearing a cross during a turbulen

I think you may be misreading this. This isn't about some person becoming a new Christian. It's about a member of high society wearing a cross during a turbulent period of competing peoples within Britain shifting from paganism to Christianity, at a time when religious symbolism was central to (synonymous with?) political symbolism.