I studied RE for a long time at Catholic school.
Then I saw a TV program on the origins of Christianty. How it branched from Egyptian religion. How and why it was picked to replace the Roman Gods.
Then I studied Mathematics and Physics to cover the aspects of what it means to disprove something. How often people have been wrong or inaccurate. How it is important to not get attached to ideas. How intuition is often incorrect vs logical proof.
So at the end of the day - Im too old for this. God lives along with Santa and the Toothfairy. No way am I going to say that Transubstantiation or the Trinity is a thing. It makes no sense.