Is it permissible for me to say to non-Muslims "And the same to you" when they wish me a Happy New Year or say Best Wishes?

A non-Muslim friend of mine asked how I could prove the existence of God and why He has given us life, and what its purpose is?
My answer did not satisfy him, please tell me what I should tell him?

Is it permissible to fast without praying?.

A girl noticed some thin discharge on her underwear but she had not felt it come out. Is it permissible for her to pray with her underwear on which this discharge has gotten? If it is not permissible, then does she have to repeat her wudoo’ and change her underwear?.

May Allah reward you with good for answering my question, but I think that it needs further explanation of the issue of sprinkling hot water on the private part, because the wet dream occurred at the time of ‘Asr prayer, and I have a problem, which is that maniy and even madhiy continue to come out for a considerable period after they are first emitted. It often happens with me that one of them is emitted at the time of prayer, whether that is because of thinking or because of a wet dream, but in order not to miss the prayer, I sprinkle hot water (on my private part) so that whatever is left will come out. Please note that I do not feel any desire when I use this method. Now I am going to make up the fast of that day that I told you about, in sha Allah, but what should I do if maniy continues to come out whilst I am praying? Should I pray in that case?

What is the Islamic ruling on the issue of imitating the kuffaar in their customs and dealings? What are the guidelines concerning that in Islamic sharee'ah? Is every imitation of the actions of the kuffaar regarded as a haraam kind of imitation, knowing that there are many things that the kaafirs do that are not haraam and are not condemned by sharee'ah, where the one who does them does not do them merely to imitate the kuffaar, but because he thinks those things are good, as Ibn Mas'ood (may Allah be pleased with him) said: "What the Muslims think is good is good before Allah"?  
Please advise us, may Allah honour you, and please give me a detailed answer and explain to me the guidelines on this matter.

What is the ruling on mixing with kaafirs and dealing with them kindly, hoping that they will become Muslim?

There are many religions.

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

What is sincerity, and what are the benefits of sincerity?

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

I have read the many pages of your web site that instructs a non-believer. I believe that there is only Allah (one God). Ibelieve that Muhammed is the seal of the prophets. History bears this out. My question is: How do I declare this (shahadah) if I do not speak arabic?  How do I perform the five daily prayers (salah) without understanding arabic? Finally would I have to change my name?

One of the guys at work was asking me why I became Muslim and I told him it is the path I must follow. I don’t know sometimes what I should say, for me it is the path I must follow. What can I say to someone; I don’t want to push what I believe, so how should I answer someone if asked, what is the right way to answer the questions? Sometimes I feel I don’t give the right answers... Any clues as to what I can say?