There is no need to state mechanically that this is the theme that is now to be discussed. This is the climax to the essay, but the concluding paragraph should generally be a brief paraphrase or synthesis of the essay.
If you do leave one part of the essay to move onto another, but intend later to go back to the point you have left and show, for example, how the points may be connected or related, then it can be useful to say so by 'signposting', e.
These technological developments have greatly increased the growth in, … Thus, … To be able to understand, … Undoubtedly, … While such failures must not be discounted, … there were in comparison small, when compared Whilst the discussion in the preceding paragraph, … Whether crime rates were actually lower at this time continues to be a matter of debate.
Do not repeat these phrases mechanically in your essays - the imagery will not always be absolutely key to understanding the story.
Does your argument need to be clearer, and do the links between some of the main points need more emphasis? The theme is still religion, but the writer is now going to approach a different aspect of it.
If it was not important then the student should not have chosen to write about it. Best wishes. If you need to brush up on the different types of essays, read this helpful article. Feel free to write complete essays on any of the subjects, or ask your tutors to provide you with more subjects and themes to write about.