Hi,
I was thinking about pure evangelist build and then realize... cleric's don't have perform, so it is actually impossible (or inconvenient).
What actually impossible is for pure evangelist to get ESF.
I would suggest to add perform to cleric (or just evangelist if technically possible) perform as class skill.
If not, give him passive bonus of 1/2 of cleric levels (it is just 15, not 17 you lose, but it mitigates the problem anyway), but this would not solve the ESF problem.
Or (worst scenario) at least put it to some domains (negligible +2 from trickery will really not cut it). I would actually let the domain have the ESF, or at least as prereq, which would allow to take it without 20 hard ranks.
Even monks, swashbuckers, assasins and warlocks have this skill for no apparent logic reason, but the second class directly using the skill does not.