Are you seriously saying that if the only difference in Plymouth was that if he was brown skinned and owned a Koran it would still not be labelled as terrorism?
If you've been in a role less than 2 years and the employer doesn't rate you, it's pretty easy for them to sack you
https://www.thrivelaw.co.uk/2020/09/03/can-you-be-sacked-without-a-warning/