The post you are reporting:
Hi Keith, I'm a deacon at Eythorne Baptist Church so take a bit of spare time here and there to study Biblical, and non Biblical, stuff to better have a more complete understanding and knowledge of the faith which I profess and the various bits and pieces of odd stuff that people are frequently mislead by and which are used to try and undermine the potential for faith in those who are seeking.
Alexander's group is unknown, as a group, to me. As for the Queen - she is not acknowledged by Anglicanism as the supreme under shepherd of the Church of England (I say under shepherd because the Shepherd is Jesus and He is supreme head of the Anglican Church, as acknowledged by the Anglican Communion, teaching and statement of faith) but is instead its temporal head in matters of the world and politics. In matters spiritual and doctrinal, Anglicanism looks to its Arch Bishops and governing Synod on earth.
Biblically it is clear that all authority on earth is God given, as He is absolutely sovereign in all things. No one gains a position of power, influence or authority without being raised by God and just as He raises them, so He can remove them. The Bible says it better than I do, but Alexander's disrespect of the Queen runs counter to Biblical teaching and the faith which he professes:
Col_1:16 For by him all things were created, in heaven and on earth, visible and invisible, whether thrones or dominions or rulers or authorities--all things were created through him and for him.
Tit_3:1 Remind them to be submissive to rulers and authorities, to be obedient, to be ready for every good work,