Divine right of Kings hasn't been a thing here since the 1600s .... James 1 brought that with him from Scotland as a current issue and it didn't take ... it was one of the factors in the English civil war and didn't survive ... it was considered old-fashioned even then by most.
The head of the church thing is a can of worms that Henry V111 opened ... not really an issue and modern monarchs fully acknowledge the status of other religions .... what happens if a future monarch decides to convert to Islam or Bhuddism? (other religions are available) will be one of the things that will be dealt with as part of the evolution of our democracy ... there's nothing intrinsic in the joining of King/Queen and church they can be split if needed and the situation go back to pre-Henry times ... it was only done for reasons of dynastic succession even back then ... and the relationship between monarchy and parliament is a very different picture now.
K