Apex domains cannot have CNAME records.
Question and response
Question
dig trinitymount.org. NS
Answer
trinitymount.org. 1 NS ns-1858.awsdns-40.co.uk.
trinitymount.org. 1 NS ns-293.awsdns-36.com.
trinitymount.org. 1 NS ns-363.awsdns-45.com.
trinitymount.org. 1 NS ns-1936.awsdns-50.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0