Allah (SWT) knows the fate of everyone after death. We are responsible to seek true knowledge about the message of Islam and follow it. Everyone will be asked in the Day of Judgement about his faith and practice. Muslims will be questioned whether they obeyed the Prophetic orders or not. Prophet Muhammad (SAWA) ordered all Muslims to keep following Quran and Ahlul Bayt (AS). This is in the authentic known as Hadeeth al-Thaqalain which is narrated in main Sunni and Shia books of Hadeeth e.g. (Saheeh Muslim, Hadeeth number 4425, Tirmithi; 3718, Musnad Ahmad ibn Hanbal ; 10681, Al-Mustadrak by Al-Nisabouri; 4576, Al-Sunan al-Khubra by Al-Nasaa'ee; 6921 and many other Sunni books.
Those who did not care to search for the truth will be questioned and those who knew but did not follow will face the result of their ignoring the orders of the Prophet (SAWA).
We believe that all Muslims who sincerely believe in Allah and the Messenger will ultimately go to Paradise even after they had to face results of their mistakes.This applies on followers of all Muslim sects except the enemies of Ahlul Bayt (AS).
Wassalam.