"Paul is talking about the ritualistic concept of "cleanliness" as it applied to meats sacrficed to pagan Gods. "
Now you are just making things up! There is nothing about sacrifice nor pagans in Romans 14. It is not about food, but about the nature of good
and evil as regards intention toward each other over things(substance).
Romans 14:17
For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.
Do you seek the kingdom or is it evil acts of DEAmen, war and the despair of discord that you seek?
I've had Romans 14 cross referenced with 1 Corinthians 8 about forty years.....and it is discussing vegetarianism for the very reason Douglas has indicated. Some folks were unsure about eating meat for the simple reason it "May" have been sacrificed to an idol. (We are talking about the Romans here!) Paul is saying....."No big deal. Eat it if you want or don't eat it if you don't want......but quit complaining about the other guy's position."
Verse one gives it away.....it is a disputable matter!
As Diego pointed out, you would be much further along if you read 1 Corinthians chapter 8. Romans 14 will make much more sense to you then.