A lot of cool relics I've seen are weapons, with a good number of these being martial weapons. This is a bit of an issue because clerics don't get martial weapon proficiency normally, meaning that you need to use a feat to be able to use your relic, which is pretty much a core class feature on EFU. If your character is high level, you might not have the opportunity to take this feat for a long time. And if you latter change relics, you might feel that you are stuck with a feat you didn't really want.
The solution? Give clerics proficiency with any relic they are attuned to. This could be done by giving them the appropriate feat (martial or exotic) so long as they are attuned to the relic. I don't think it would really buff clerics so much, but rather it would let them use a greater variety of cool relics and lessen the feel-bad moments of finding a relic that really fits your character, but you can't use because you are missing the feat for it .
The relic weapons which require martial weapon proficiency are generally geared towards martially inclined clerics. If you aren't a cleric of that sort you wouldn't have much use for them anyway.