there are no degree's of sin...the thought that one thing is worse than another is a worldly concept. "steal a penny or kill a man...it's the same sin"

The idea of sin being sin is scriptural and is mentioned too many places to even quote here, but one of he more popular quotes is "before you point out the splinter in your brothers eye remove the board from your own".
You may argue this all you lke but the fact remains that all sin that you have not asked forgiveness for will condemn you.
AND there are no umforgiveable sins...the catholics just like to make shit up.