Is the īmān (faith, belief) of the heart sufficient for a person to be a Muslim, whilst being far from the prayer, fasting and zakāh?

"If he wishes to, take it, seeking cure is Mubaah (an action that one is not sinful if one doesn’t do it, nor is he rewarded if he does it), (so) he does not fall into Sin (for not taking it)."

"Sadly, the source of medicine in all of Europe which includes America, their source was the Islamic countries. However, the people have pursued the world and wasted both religion and the world [in the process]."

The questioner says: What is your advice in relation to the Coronavirus, shall we return from the lands of the disbelievers or shall we remain here?