I think you confuse cursing God with not understanding God's ways. Job was impatient and unhappy the Lord didn't justify him quickly enough but that is not cursing God.
Oh? Have you ever bothered to look at what it means in Hebrew?
1288
01288 barak {baw-rak'}
a primitive root; TWOT - 285; v
AV - bless 302, salute 5, curse 4, blaspheme 2, blessing 2, praised 2,
kneel down 2, congratulate 1, kneel 1, make to kneel 1, misc 8; 330
1) to bless, kneel
1a) (Qal)
1a1) to kneel
1a2) to bless
1b) (Niphal) to be blessed, bless oneself
1c)
(Piel) to bless
1d) (Pual) to be blessed, be adored
1e) (Hiphil) to cause to kneel
1f) (Hithpael) to bless oneself
2) (TWOT) to praise, salute, curse
Now, the tense of the verb "curse" in this verse is Piel:
1c) (Piel) to bless
And thus the meaning of the verb is to "bless".
Piel usually expresses an "intensive" or "intentional" action as well as it also implies a repeated action meaning it is usually done more than once. In this case someone will “bless” God more than once.
OT:1288
barak (baw-rak'); a primitive root; to kneel; by implication to bless God (as an act of adoration), and (vice-versa) man (as a benefit); also
(by euphemism) to curse (God or the king, as treason):
Lexicon:
"It is properly used of persons, and is transferred to
curses and impious words against God." This specific definition for the word in question is found in Job 1:5, 1:11 and Job 2:5.
Job 1:11 But put forth thine hand now, and touch all that he hath, and
he will curse thee to thy face.
Job 2:5 But put forth thine hand now, and touch his bone and his flesh, and
he will curse thee to thy face.
So what Satan literally said was:
"he will speak impious words against you"
American Heritage Dictionary - Cite This Source - Share This
im•pi•ous (im'pe-?s, im-pi'-) Pronunciation Key
adj.
1. Lacking reverence; not pious.
2. Lacking due respect or dutifulness: impious toward one's parents.
In today's terms it would mean
Job spoke in disrespect to God, and about God.
Job 1:22 In all this Job sinned not, nor
charged God foolishly.
Charging God foolishly would be equal to cursing/speaking disrespect and impiously toward or about God.
Eventually Job would commit these bad things and sin.