Going by basic logic==there's no such thing as a skeptical believer...
All 'grey areas' are reserved for skeptics....
When someone says:
then that makes you're a believer! How can it not?
There are some things that don't have a ready explanation. Now, just because they don't appear to be a conventional phenomenon doesn't mean that they are manned by LGM.
If something is a UFO that just means it is unidentified, not that it is an AFO (Alien Flying Object).
If you tracked an object from deep space (preferably very deep space) to the earth, that is a different story.