ANSWER:

If a person is not certain of Islam, this is an act of apostasy as Islam is a firm belief in the heart. Without it, one would not be a true Muslim. 

This is different than when a person is a practicing Muslim but he gets these intrusive thoughts every now and then and yet he fights them and blocks them to the best of his ability.

Sometimes thoughts comes to mind if your deen is not true what will you do if your deen fabricated. I dont know why this thoughts come to my mind. Whenever this thoughts comes i feel like i left islam. Is my islam intact?

Waswaas - Whispers of Shaytaan |