Homosexuality is the sin that caused God to wipe out Sodom and Gomorrah.
It's also the sin noted to be an abomination.
So yes, some sins are greater than others.
You can try to put fornicators and homosexuals in the same category all you want, but scripturaly, they aren't.
Um, what about pork and shellfish???
Also, here is a list of sins that are an "abomination":
idolatry or idols (Deuteronomy 7:25, Deuteronomy 13:14, (Isaiah 44:19)
illicit sex (Ezekiel 16:22,58, Ezekiel 22:11, Ezekiel 33:26)
illicit marriage (Deuteronomy 24:2-4)
male homosexual and (collectively) heterosexual immorality (Leviticus 18:22, Leviticus 18:27-30, Leviticus 20:13
temple prostitution (1Kings 14:24)
offerings from the above (Deuteronomy 23:18)
child sacrifice (Jeremiah 32:35)
cross-dressing (Deuteronomy 22:5)
cheating in the market by using rigged weights (Deuteronomy 25:13-19, Proverbs 11:1)
dishonesty (Proverbs 12:22)
dietary violations (Deuteronomy 14:3)
stealing, murder, and adultery, breaking covenants, (Jeremiah 7:9,10
violent robbery, murder, oppressing the poor and needy, etc. (Ezekiel 18:10-13)
Homosexuality is NOT the only one.