extreme fundamentalism and extreme relativism

The more I think about it, the closer extreme relativism and extreme fundamentalism seem to be together:

• Both is entirely subjective, and do not even seek to be objective, in it’s extreme forms neither to recognize their own subjectivity.
• The individual caught up in both will hold to their already-found believes come hell or high water, and wouldn’t even consider the possibility that it might be they who are wrong, since it isn’t needed to even consider that they might be wrong.
• Both approaches give it’s proponents the amazing ability to percieve their worldview as absolutely consistent even when it clashes with all of reality.

In the end both approaches adhear to the same basic idea: their is no truth except for the truth which I hold.