How do I break these two up?

[Minor Annoyance]

I planned on attacking the only other civ on the continent but they've got a defence pact with that pirate civ. I've asked them to change religion to lover their relations and it went down to pleased, but I don't know how to get it lower. I've only got one city that can build ships reasonably fast so defending the coast would be hard as would moving to attack another continent. Anyone know what way I should go?
The saved file's attached.

 

[xienwolf]

Fireballs can defend your coasts pretty well. But honestly you don't need to worry about your coasts at all if you only have 1 coastal city. Stack some defenders in there and keep a mobile force ready to hit wherever the Lanun decide to land at.

 

[Minor Annoyance]

Actually I have four coastal cities it's just there is only one that has a good supply of hammers. I did realize I could take out pirates with hidden nationality instantly with a land unit so that's good for peacetime at least.