There is no compulsion where the religion is concerned. Right guidance has become clearly distinct from error. Anyone who rejects false deities and believes in Allah has grasped the Firmest Handhold, which will never give way. Allah is All-Hearing, All-Knowing. (Surat al-Baqara, 256)
Among the people there are some who say, ‘We believe in Allah and the Last Day,’ when they are not believers. They think they deceive Allah and those who believe. They deceive no one but themselves but they are not aware of it. There is a sickness in their hearts and Allah has increased their sickness. They will have a painful punishment on account of their denial. (Surat al-Baqara, 8-10)
When they meet those who believe, they say, ‘We believe.’ But then when they go apart with their demons, they say, ‘We are really with you. We were only mocking.’ (Surat al-Baqara, 14)
That is because they have had belief and then returned to unbelief. So their hearts have been sealed up and they cannot understand. (Surat al-Munafiqun, 3)
There is a group of you who propagated the lie... (Surat an-Nur, 24)
There is a sickness in their hearts and Allah has increased their sickness. They will have a painful punishment on account of their denial. (Surat al-Baqara, 10)