How does participating in Hajj affect the life of a Muslim?

Does falling into sin indicate that there is something wrong with one's 'aqeedah (belief system)?

I bought the ihram garments, and the set came with three pieces, two pieces like towels, one for the upper part of the body and the other for the lower part. As for the third piece, it is to be used as a kind of underwear on the lower part. The three pieces are not stitched, but they have two metal snap fasteners for securing the garments.
Does the fact that it has two metal snap fasteners to secure it make these garments unacceptable according to sharee‘ah? I heard that it is not permissible to wear the third piece that is described above – is that correct?

A Muslim woman swore that she would not speak to another Muslim woman because of a dispute that had arisen between them. Then the other woman sent her several text messages, repeatedly, so the first woman responded by a text message. Now the first woman is asking: do I have to offer expiation for breaking an oath or not? What should I do if I want to talk to her again?.

How is major ablution done? There are differences of opinion in a number of madhhabs, so who should I follow?
How did the Messenger (blessings and peace of Allaah be upon him) to minor and major ablution?.

What is customary is for us to say “Blessings and peace of Allah be upon him (sall Allahu ‘alayhi wa sallam)” specifically for our Prophet Muhammad (blessings and peace of Allah be upon him); is it permissible to offer this supplication with this wording for other Prophets? Who are the only ones for whom the following phrases are to be used: may Allah be pleased with him (radiya Allahu ‘anhu), may Allah have mercy on him (rahimahu Allah), may Allah keep him safe (sallamahu Allah)? Is it permissible to offer supplication for a great scholar who strove all his life to call people to Allah and His Messenger, such as Shaykh ‘Abd al-‘Azeez ibn Baaz and other, similar contemporary scholars, when they die, by saying “may Allah be pleased with him” or “peace be upon him”?

My husband and my family do not get along, they are not muslim, although I have invited them many times, nor do they understand Islam.  My husband wants to prevent my parents from seeing my children because he feels they have cursed Allah, although they have not done so.  Is this allowed?

My question deals with a friend of mine who was ignorantly joking. When my friend was teased by another friend he ignorantly picked up his phone out of joking and said I have to tell Allah. Then he said on the phone "Hello, Allah" as to tell Allah. I know this is incorrect but is this shirk?

He masturbated during the day in Ramadan in order to provide a sample of semen for testing in the case of infertility; what are the consequences of that action?