back-slider:
(also with the spelling ‘backslider’; plural: ‘backsliders‘)
Azerbaijan and its President, Iham Aliyeu, called 'world's worst backsliders on press freedom'
a person who gives up (or not practise any more) morals, especially in a religion; a reversionist;
a person who goes back into the bad past life — taking up the bad or harmful habits which were given up in the past;
a recidivist; a turncoat,
Most of the politicians and leaders come to power as reformers but eventually become back-sliders.
There is no specific law to punish religious backsliders.
Nadeen is such a backslider that not even his family members trust him.
