On the website, "Edenics- Where Language Began" it is mentioned that the Hebrew word 'zinoot'(fornication) a Zayin-mem word have influenced the English sin". Since the z and the s are closely associated with each other phonetically can we assume that this is a small linguistical connection forming a plausible route to explore further or is this just speculation?
In contemporary Hebrew, znut means "prostitution". It's related to zayin "cock, dick". Concerning pronunciation, it is unlikely that Hebrew znut and English sin are related. The first Hebrew sound is /z/, the first English sound is /s/. Here's the etymology of English sin. One can see there and here that the Hebrew word for "sin" is חטא khe'.