What are the Virtues of the Day of Arafaah?

Why is Allah always reffered as 'He'? I ask this because my teacher in class raised this issue.
 

What is the difference in meaning between Allah's names al-Rahman and al-Rahim?
 

What is the definition of gheebah and what is the ruling on it?

There is a Quran out which is called "Quran pen reader 9" which helps you better your tajweed and you can listen to different reciters and when you press the Quran with the pen they give it says it out loud the verse you have pressed and you can pick different reciters so you can remember it and correct your tajweed and the Quran it self has interactive buttons on the side like e.g tafsir of the ayah ,which qari you want to chose ,change the level of volume and pick which language you want etc
I wanted to know do I still read this Quran like a normal Quran and will I get the same reward of reading this then a normal one were this one helps me correct my mistakes and makes me understand the Quran more and it is the full Quran with just it being interactive and I was thinking will this be a sort of bidah? But theres more benefit in this as I have mensioned everything this does for the improvement of understand and correct my tajweed and knowledge in the Quran ?

When I do Salah (formal prayers) or intend to do good deeds I often get very evil thoughts in my mind. When I concentrate in Salah, and try to focus on the meaning of the words, evil thoughts enter my mind, which make evil suggestions about everything including Allah. I feel very frustrated and angry about this. I know that none forgives sins except Allah alone, but because of my thoughts I feel that there is nothing worse than to have evil thoughts about Allah. After Salah I ask Allah's forgiveness, but feel very bad because I want to stop these evil thoughts, but I can't stop them. These thoughts spoil my enjoyment of Salah, and also make me feel as though I am doomed. Please advise me.

Can we use dishes that non-Muslims had formerly used to cook pork or other unlawfully slaughtered meat or used to eat such meat from? I ask in reference to the hadith about the dishes of the people of the Book: "Do not eat from them unless you do not find anything else to eat from. In that case, wash them and eat from them.”
 

There are many religions.

Why do Muslims think that Islam is true. Is there any factual basis?

 As-salamu `alaykum. I work in a software company where the dress code is business formal. So, it’s compulsory to wear shoes. The thing is I have to remove my socks and shoes every time I make wudu’. I heard that it’s not necessary to remove socks for wudu’. Well, I'm not sure about that and its procedure. So, if there is any alternative to this, then, please, enlightenment me on this. Jazaka Allah khair.

Will a person (a believer) be rewarded if he listens to the Qur’aan without understanding what he is listening to, but he knows that it is Qur’aan? Or will he not be rewarded unless he understands what he is hearing? I hope you could give some evidence from the Qur’aan and saheeh hadeeth.