I believe in god , but if god is there why such horrible and bad things happens in this world ,why people became so much evil today ,if he is there watching all this, he could be out of power or he might abandoned us ? i can't understand why ?

While we can only guess at which incarnation of God you believe in, look to the nearest Holy Book:

The Quran says, "Allah causes whomsoever He wills to stray in error, and sets whomsoever He wills on the straight path." This portrays a capricious, meddlesome God.

The notorious contradiction between freewill and an omniscient God might be cause to just resign yourself to the incomprehensibility of God's thinking, as per Isaiah 55:9 -"For as the heavens are higher than the Earth, so are my ways higher than your ways and my thoughts than your thoughts". Likely why there is no Bible passage which praises human intelligence. Surely a handy passage for squashing inquiry.

Deists believe that a Creator being exists, but one who doesn't intervene in earthly affairs. Deists also reject revelation and authority as sources of religious knowledge. 

Then we have Epicurus, who famously posited: 

"Is God willing to prevent evil, but unable? Then He is not omnipotent. Is He able but not willing? Then He is malevolent. Is He both willing AND able, then whence cometh evil? Is He neither able nor willing, then why call Him God?"

You owe yourself a serious evaluation of what it is you believe; does it really make sense to you, does that even matter, or are there other ideals that might be more persuasive for you.

If there is a god, surely He could withstand the puny test of mortal scrutiny. If there isn't a god, then you aren't risking offending one by inquiring.

I believe in God in as I believe there is a higher power. I am not so big on organized religion as I believe it has been twisted over the years to fit to the agenda of those in charge. With that said, God does not have power over man and his/her decision making. Organized religion tells you God gave man free will. It is up to us to make the right choices with it. Many people don't. Many not only turn away from God, but human decency as well. To be clear, I am not saying everyone who doesn't believe is evil. There are far more great people who are atheist than there are bad. There are also too many evil people who use God and other religions to hurt others. Unfortunately to is just some evil people.

Revelation 12:12 explaines why,  "On this account be glade, you heavens and you who reside in them!  Woe for the earth and for the sea,because the Devil has come down to you,having great anger, knowing that he has a short period of time."  Soon God will rid the earth of all evil and suffering cause by Satan and those who are wicked, Psalm 37:9 -11, "For evil men will be done away with, But those hoping in Jehovah will possess the earth. Just a little while longer,and the wicked will be no more; You will look at where they were, And they will not be there. But the meek will possess the earth, And they will find exquisite delight in the abundance of peace,"  Many feel that God is slow, about his promise, the Bible shows that he is not slow but he is,  "Patient with you because he does not desire anyone to be destroyed but desires all to attain to repentance." 2Peter 3:9

So, you raise a good point in asking this question.

The problem is in asking the question based upon your faith . . . Most faiths will have you accept that God is Just, Righteous, and the source for this would be the characteristic of Omniscience. If God did know everything . . . He is Righteous and Just in the deaths of millions . . .

Here is a good reference that I absolutely love:

The problem with the God of the Bible, starts in Genesis ... With the story of Adam and Eve.

If god created their nakedness ... Why would they be ashamed of it?
Why is nakedness "bad", if that was the state god created and there was no corruption at that point?

From there on, the Bible just gets more ridiculous.

Organised religion is palpably ridiculous. Particularly the need to work "free will" and "unquestioning faith" into the Abrahamic religions.

With regard to the existence of a higher being, I am agnostic, I cannot prove there is no such thing, and occasionally, I even think some higher "intelligence" must have been necessary for the creation of the "Universe we know".

BUT.... If such a being exists, why would he/she/it care about lesser beings? What would be the point?

Please do not quote badly-interpreted scripture at me. I went through all that 40 years ago.

god is a particle not a person.

You are the god you seek.

Free will we have

I believe in god , but if god is there why such horrible and
bad things happens in this world ,why people became so much evil today ,if he is
there watching all this, he could be out of power or he might abandoned us ? I
can't understand why ?

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1- The “horrible and bad things” are either part of the laws
of nature, things like volcanoes, earthquakes, floods, droughts, tsunamis etc,
or part of what we humans do because we have been given free will and left to
do all the evils we want to, and there is no species on earth which has done
more evil than we humans.

2- God is defined with the attribute of omnipotence. So He
can stop humans doing all these “horrible and bad things” but if He did so then
He cannot say we have free will to choose between doing good things and doing all
these “horrible and bad things”