> "only putting natural stuff in my body"

That's not a belief, this is a stated preference, and you would be fully entitled to ignore it as "invalid criticism" due to the confusion between facts and opinions.

The belief that you are actually asking me to "back up with links" is that GMO reduces genetic diversity. Do you really need a link for that?

There's no need to get so worked up. But yes, you have to provide more evidence than just a claim, expect everyone to assume that it's somehow logically congruent, and that all skeptics are stupid.