punjabi, gurmukhi.
Sikhs mostly speak Punjabi, and write it in a script called "Gurmukhi" (mouth of the Master). This is made up of 35 letters, which are called the "Penti" (which means 35).
The family go to the 'Gurdwara' (Sikh temple) and get a letter from Gurumukhi (thepunjabi alphabet.) They then use that letter to become the first letter of the babies name, and think of the rest of the name themselves.
Sikhs have gurudawaras
Sikhs is not real
Since the meetings are of Sikhs, so usually Sikhs are present there.
Yes Sikhs have weddings.
Sikhs join the Khalsa.
Sikhs wear a kara, kirpan, kaccha, kanga, and kesh to show that they are Sikhs and that they are proud.
The Gurudwara is a place of worship for Sikhs.
Sikhs only cremate.
Yes, there are about 500,000 Sikhs in the UK
The holy book of Sikhs is Gurugranth Saheb.