Quran Is Not Difficult

We have not sent down the Qur'an to thee to be (an occasion) for thy distress,  But only as an admonition to those who fear (Allah),- {A revelation from Him Who created the earth and the heavens on high. {4} (Allah) Most Gracious is firmly established on the throne (of authority).  To Him belongs what is in the heavens and on earth, and all between them, and all beneath the soil.

(Surah Taha){Verse 2 To 6}

About Mountains

And they ask you about the mountains. Say: My Lord will carry them away from the roots. Then leave it a plain, smooth level .You shall not see therein any crookedness or unevenness.  On that day they shall follow the inviter, there is no crookedness in him, and the voices shall be low before the Beneficent Allah so that you shall not hear aught but a soft sound. 
 (Surah Taha){Verse 105 To 108}

Will destroy the world

How many a township have We destroyed! As a raid by night, or while they slept at noon, Our terror came unto them. No plea had they, when Our terror came unto them, save that they said: Lo! We were wrong-doers.

(Surah Al-Iaraf) {Verse 4 To 5}

Reasons Of Obey

Those are limits set by Allah: those who obey Allah and His Messenger will be admitted to Gardens with rivers flowing beneath, to abide therein (for ever) and that will be the supreme achievement.But
those who disobey Allah and His Messenger and transgress His limits will be admitted to a Fire, to abide therein: And they shall have a humiliating punishment.

(Surah Nisa) {Versr No.13,14}

Have Allah Son !!!

They say: "(Allah) Most Gracious has begotten a son!" Indeed ye have put forth a thing
most monstrous!  At it the skies are ready to burst, the earth to split asunder, and the
mountains to fall down in utter ruin,That they should invoke a son for (Allah) Most Gracious.
For it is not consonant with the majesty of (Allah) Most Gracious that He should beget a son.
Not one of the beings in the heavens and the earth but must come to (Allah) Most Gracious as a servant.

(Surah Maryam) {Verse No.88 To 93}

Allah Is One

Yet there are men who take (for worship) others besides Allah, as equal (with Allah)
They love them as they should love Allah. But those of Faith are overflowing in their
love for Allah. If only the unrighteous could see, behold, they would see the penalty
that to Allah belongs all power, and Allah will strongly enforce the penalty.
Then would those who are followed clear themselves of those who follow (them) They would
see the penalty, and all relations between them would be cut off.And those who
followed would say: "If only We had one more chance, We would clear ourselves of them, as
they have cleared themselves of us." Thus will Allah show them (The fruits of) their deeds
as (nothing but) regrets. Nor will there be a way for them out of the Fire.

(Surah Baqrah) {Verse No.165 To 167}

Reasons & Benefits Of Rain

It is He who sends down rain from the sky from it ye drink, and out of it (grows) 
the vegetation on which ye feed your cattle. 
With it He produces for you corn, olives, date-palms, grapes and every kind of 
fruit verily in this is a sign for those who give thought. 
(Surah An-Nahal) {Verse No 10,11}