As it is established among the Muslim majority that only Sunni islam is the true representative of Islam. One can pray in any mosque that belongs to this 85%+ majority. All Salafai, deobandi, Barelvi, Maliki, Shafii, Hambali, hanafi, ahlul-hadeeth etc belong to Sunni Islam. I personally pray in any mosque that belongs to any of them. read more
Shia have 5 pillars: 1. Belief in One God 2. Justice 3. Prophethood 4. Succession to Mohammad 5. Belief in the Day of Judgement. On top of that, Shia have 10 further practices 1. Prayer 2. Fasting in the month of Ramadan 3. Zakat 4. Khums – compulsory alms, 20% for Imam and the needy 6. Pilgrimage to Mecca 7. read more