“Robert Carter” is a relatively common name, and indeed – behind “Robert Carter” we can find several worthy candidates for our encyclopedia. This guy is one nice example, but this Bob Carter (the rather famous namegiver to what is currently known as ”Cartergate” disqualifies himself by being British .
The intended Robert Carter is much less dangerous, unfortunately, but not quite toothless. He is head speaker/”scientist” for Creation Ministries International. Apparently he must be a great scientist, since Creationwiki (yes, such an entity exists) points out that ”in a  debate with Rick Pierson that 590 people attended to Carter brought up a stumping question to Pierson that left him speechless, stopping him in mid sentence.” (the question isn’t quoted). His status as a serious scientist is surely bolstered by the fact that ”CMI-Canadian and Canadian churches are coming together to find a way to better equip citizens about the lies behind Darwin's theory. Robert Carter as one of the speakers are hoping to give Christians the knowledge and boldness to uphold scripture and use it for Christ's purpose.” I couldn’t find any peer-reviewed publications from him, however.
He specializes in preaching to congregations, however, and I think this calendar of events from the Minot Baptist Church tells you all you need to know. In particular, his talk "Dinosaurs and the Bible" – planned for all Home Schoolers, but ALL ARE WELCOME!, sounds rather ominous and can actually be argued potentially to cause more than a little harm (this seems appropriate here). He doesn’t really give much heed to facts, but neither does his audience – his honesty and integrity can probably be evaluated from this (sympathetic) report.
Oh, and according to his bio, Carter wasn’t always a creationist etc. His gang can be found here (note the welcome appearance of our old friend Gary Bates, the Christian ufologist, here as well).
Diagnosis: Godbotter and pathological Liar for Jesus. Crazy fundamentalist whose extremism might conceivably move the Overton window with respect to some of the choirs he’s preaching to. I'll count him as moderately dangerous, even if his impact is limited.