What are the dates of the birth and death of the Messenger (blessings and peace of Allah be upon him)? I have seen many opinions concerning that; which is the correct opinion and what is the evidence in the light of the Qur’an and Sunnah

Can we perform dhikr congregationally and in unison? If yes, when, where, how, and at what time? If no, what about the numerous hadîth stating thet the Companions used to remember Allah in groups? [For instance: Riyâd as-Salihîn of Imam al-Nawawî (Arabic & English) under the topic "On Remembrance in Company" (chapter 246, page 661)]
 

We celebrate the birthday of Prophet Muhammad (peace be upon him). On this day, we read a lot of salutations on him and engage in a lot of prayers to Allah. We try to show our love for our Prophet (peace be upon him). How come you say we cannot do it?
 

In our country we have been affected by war and we were expelled from our land 23 years ago. Praise be to Allah, my father and I are settled now and we have a business. We borrowed money in order to settle and start a business, the value of which was 1 million. When we worked out the value of zakaah that we owe on the property and trade goods that we have in our possession, it was estimated to be 7 million, and the trade goods on which zakaah is due are worth 5 or 6 million. 
My questions are: 
1. Are we required to pay zakaah, as we have not paid it all these years because we were not able to pay off the debt of 1 million? Was it correct for us not to pay zakaah?
2. We do not have any cash now, if we are required to pay zakaah. We helped a brother of ours to pay off a debt he owed, so that he could pay off the borrowed amount without paying the interest that had been agreed upon. Is it possible for us to waive this debt and thus pay off the zakaah that we owe?
3. We own some property in the country where the war was, that we took possession of after the war ended, and we are planning to sell this property in order to pay off debts and so that we can buy a house in the place where we live now. Is this property subject to zakaah?.

I am currently living in Canada for the purpose of study, but my permanent place of residence is between Jeddah and Amman. When I stayed in Amman during the summer break, I decided to go to Jeddah to deal with some official papers, and I intended to do ‘umrah if Allah made that possible for me and if I had a mahram and enough time to do ‘umrah. I intended to do ‘umrah from Jeddah because my mahram would be there. But because I was not certain that I would be able to do ‘umrah, on the day I travelled by plane I did not do ghusl, because I was menstruating and I had not yet decided to do ‘umrah. When I got there on the second day I did ghusl and formed the intention to do ‘umrah from Jeddah, and I did it.
My questions are:
Is my ihram from the miqaat of Jeddah considered valid or not?  Because of my family circumstances, we are always moving back and forth between Jeddah and Amman, and we always enter ihram from our house in Jeddah, even if we are on our way back from a trip to Amman and after staying in Jeddah for several days. We do not remember how many times we have done ‘umrah in this manner.
What is required of us if we should have entered ihram from the miqaat for the people of ash-Shaam (Greater Syria)? After I did ‘umrah I was uncertain as to whether I was completely clean following my period. If I think it most likely that I was still menstruating whilst I was doing ‘umrah, what is the ruling on my ‘umrah and what expiation do I have to offer?.

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 ?

Perhaps my question has been asked many times before. It is about mortgages in non-Muslim countries. We live in a western society and we live in rented accommodation so as to avoid riba. Recently we found out that there are no houses for rent, and 96% of the market is based on mortgages. All houses are offered for sale only. Some of them told me that in this situation it is permissible for me to  buy a house by means of a mortgage and, moreover, it is possible to get the mortgage in the name of family insurance, so that the individual does not pay riba or a mortgage; rather it is paid by the insurance. Is it permissible to get a mortgage in the name of the family insurance, in such a way that you and other trustees or borrowers are not dealing directly with the bank and the lawyer takes care of dealing with the mortgage on your behalf?
I hope that you can advise me as to whether that is permissible or not.

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

I hope you can give me some examples of good deeds that we can do every day to increase our hasanaat.