When you are ohm testing the coil you should have infinite ohms between the coil out put and the hot or ground. If you have ohms your coil is fried together (primary and secondary winding). The ground side of the coil should pulse use the herts function on your volt meter. If you read out 0 herts its probably your ignition control module aka igniter. The igniter consist of 4 wires running to it, its under your distributor cap, its held on by 2 bolt.

www.hondateck.info use this site search prelude try and find your etm (electrical trouble shooting manual) you will see what I am talking about. The ecm controls the ignition control module the ignition control module controls the coil.

The main relay shouldn't cause a not spark condition. Its not even involved in the ignition system.

Are you getting fuel?