Gonna try to offer answers to these questions since they are excelent questions and I do have thoughts about each.
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1- Is God perfect?
Yes God is perfect. On the other hand he deliberately made an imperfect creation. The reason why deals with your fourth question and the nature of free will.
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2- If God were to redo all from the beginning would he do it the same way all over again, thus history repeats its self?
See 4
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3- Does God learn by experience?
Being all knowing he doesn't need to learn
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4- Is God a dictator and do we as humans have a more merciful civilized system than God’s?
God is an all loving all good being. Part of being a loving being is wanting to be loved back. Now to love humanity needs some thing absolutely fundamental. The capacity for hatred. If God had created us so we could only love him and we could only obey him then in truth how we felt towards him would have no meaning. Consider it in a broader context. What meaning would Martin Luther King Jr's life have in a world where discrimination never existed? He would probably still have been a leader but he wouldn't be remembered as a hero. Conflict in life(like in fiction) is what defines who we are.
The wicked get punished because God is all good. People tend to forget but part and parcel of being good is the concept of being just. Only one man in history has ever lived a life with out error in thought or deed so no man has reached the standard of Heaven. This is not in fact a form of cruelty. No human burdened with sin can bear to be in the presense of God. Think about it like this. When you were a kid how did you feel when your parents caught you doing some thing you knew you weren't supposed to. Now imagine a parent who knows every bad thing you've done or even thought of doing in the entire course of your life on earth. Could you bear to stand in front of him? I don't think I could.
Before Christ Judaic tradition sacraficed animals for the forgiveness of sins. The idea being the animal faced death in place of the person (an idea a later derivation of which gives us the modern term scape goat). Christ was a man with out any sin of his own who choose to take the punishment for the sin of every one else(to answer a previous statement that would be the punishment of every one in all of human history). Asking in return for love, and people to honestly repent of there crimes.
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5- Where is the holly spirit?
In terms of judging I try to avoid judging people in terms of going to Heaven or Hell. I'm not God I don't have that right. As for the holy spirit its in the hearts of beleivers. The trinity are three sides of God's personality(to give an example to explain it better how I act at work isn't the way I act when I'm with my closest freinds, and the way I act with my family is different then both but all three are still me). The Holy Spirit is the part of God that exists with in man. Its what gives a believer the power and authority promised in Scripture. You can find specific refferences in regard to the Pentecostal feast after which the apostles were able to speak and have all listeners understand what they said in there native tongue(in other words while they spoke aramaic the romans heard it in latin) because of the Holy Spirit entering them.
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6- Who is the real God and why doesn’t he show himself once and for all? Why all the mysteries and the riddles?
Goes back to the issue of love. IF God gave an interview on the seven o clock news tonight the entire world would probably convert to Christianity(or what ever religion he espoused) en masse by the eight. The problem is no one would do it out of love they'd do it out of fear that he'd get cheesed off. Its also a simple truth that in the long run it doesn't help. Adam and Eve both spoke with God but still managed to disobey him. Peter was the closest follower Christ had and saw all manner of wonder and preformed miricales in his name yet he still denied even knowing Christ three times in the same night. For that matter Lucifer is the ultamite example of this he knew God existed, knew God had power and dominion over the earth and was its maker yet he still choose to rebel.
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7- Does Christianity breed a sense of low esteem for being who you are a human?
See this is a popular myth among non Christians and ultamitely ubsurd. Christianity simply recognizes a fundamental truth about humanity. That we make mistakes and will always make mistakes. In other faiths(Hinduism for example) the only way to ever escape living on earth is by living a perfect life. In Christianity its believed you can't live a perfect life(off hand how many people can you name that honestly never violated one of the rules of the bible bearing in mind that thought is equally important as deed I can list a few that come close but I don't believe any managed it 100%). The point of it all is that God loves us in spite of our failings. That he loves us so much that he was willing to put some of himself(I don't believe Christ was the entirety of God because no human vessel can contain infinity and several times in the bible God speaks to Christ(ie at his baptism God says "this is my son in whom I am well pleased") and suffer every thing we do. Whats more he was willing to take the sum total of eternal torment for every human being in history onto himself(for the wages of sin are death) and to make a hat trick of it God loves us enough that he takes the pain of every slight ever commited against his followers(what so ever you do unto the least of my followers you have done unto me). For my own part I find nothing in those ideas self degrading quite the opposite. Theres a real peace in the idea that no matter how badly I mess things up God still loves me and is willing to forgive me if I ask for it. I'll admit thats an emotional response not a logical one but thats ok with me to.
I know this has been kinda long but they really aren't simple questions. I also realize that people are going to probably disagree with what I say(including probably a few christians) and thats ok to. This is on the other hand what I believe personally.