Q: If one fears kufr for oneself, will it be permissible to commit suicide so that one can die with iemaan?
A: No one can determine how he or she will die. This is entirely up to Allah. For this reason it is futile to even think of suicide. Furthermore, the danger in this stupid notion is that one might regard suicide as lawful, a belief that in itself renders one outside the fold of Islam. As for the fear of kufr, this is just a deception of shaytaan. There is nothing to worry about in this regard. Make the thikr of the Kalimah daily, and Insha Allah, your iemaan will remain till the end. May Allah Ta’ala protect the iemaan of all Muslims, aameen.