Right now on syndicate you do not generate holy power at all if crusader strike gets dodged / parried etc.
By Sithari (427 – 5·3) on 2010/10/16 (Patch 4.0.1)
" After some testing on live I can confirm the following:Holy Power charges persist once combat is over, and disappear at a rate of 10 seconds per charge. If you kill an opponent with 3 charges left, you got a 10 sec window to use a 3 charge ability (or re-enter combat), and a 30 second window to use any ability that requires at least 1 Holy Power charge.The Holy Power charge generation of Crusader Strike is 100%.This means it is solely dependent on you casting the ability, rather than whether the ability lands or not.
Under normal circumstances (ignoring haste effects and assuming you are casting Crusader Strike on every cool-down) you generate 1 Holy Power charge per 4,5 seconds, whether it hits, crits, misses or is dodged, blocked and parried by your target."