With omnipotence comes the ability to do anything he wants
with omniscience the ability to know all
and all-goodness, the want for only good.
If these three are correct then evil could not exist. For if a being wants only good and has the power to do anything it wants, then there would be nothing but goodness.
This is an interesting arguement but in my opinion a very simplistic view of reality. For example my wife is a clean freak, She has children that are much weeker than her, She also has access to dog kennels. Because she detests messes and our children are messy she must lock them up in the dog kelles all day long!
Obviousely this is rediculus (no need to cal lthe police). Yes she hates messes, but we both knew when we decided to have children that messes come with the teritory, so now her task (and mine too I guess) is to raise them to be responsible (clean) people.
It all comes down to what was God's goal in creating us. If it is as Scripture teaches for us to have a loving relationship with Him, then the alowance of evil is justified in three ways:
1. Love is not possible without choice: If there is "true choice" given (complete freedom) it is inevitable that wrong choices will be made with the good. Some have tried to say "couldn't God have created people that would only make right choices" - If He did that the obviouse conclusion is that they would not really be free, therefored not really choosing, and therefore incapable of true love.
IF love is the Goal, than allowing mankind to make choices (both good and bad) is a necessity to accomplish the goal.
2. God's allowance of evil is ultimately for our benifit. God desires us to love him, and to know Him (understand what he is like). Without the temporary allowance of evil, this would be imposible, because we would have no choice (therefore no love), and we could not know Him because his person would be hidden from us.
Let me clarify that last statedment:
All of the charactoristics of God that draw so much attention are only truly visable in a world that has opposition to God. For example how would God reveal to us his mercy (mercy means not giving judgement one deserves) without evil. How would we understand the patience of God, without opposition to Him? How could we trully understand the quality of an unselfish love unless He sacrificed himself for those that did not deserve it?
So God temorarily allowed evil to make true love posible, and so we could truly know the quality of the one that is asking us to choose him.
3. The temporary nature of evil. Again to use my wife (the clean freek) as an example. She detests messes, it litterally pushes her around the bend, but we deceided we wanted to build a house and do most of the work ourselves. She had to decide that living in a temporary mess was worth the end result.
God has made it very clear from the start that evil is temporary, when the goal is achieved, all evil will be dealt with.
In light of these three realities, I do not see God's allowance of Humans to make evil decisions incompatable with God's goodness, His strength, or His knowledge.
You may also say that for good to exist, there needs to be evil, but if this is true then God could not be the creator of everything, for to be the creator of everything means that there was a time where only he existed, and being all-good would mean there was a time when good existed without evil.
You are absolutely right. To say good needs evil to exist is obsurd! Evil is parasitic in its nature. Evil can't exist without good, but good most definitely can exist without evil.
The arguement that you have given is a good one, but at best all it does is question the wisdom of God, it is in no way a "silver bullet" that eliminate the possibility of a Deity.
If I have time tonight I will give a reason or two for believing in God's existance that you can evaluate.