Does the feeling of strangeness and the difficulty of imagining the events of the Barzakh and the Day of Resurrection, despite full belief in them, undermine one's faith, or is it a natural feeling given that the human being is veiled from the unseen?

There is nothing strange about a person's astonishment and wonder when contemplating the events of the Barzakh (interim period between death and resurrection) and the Day of Judgment. This does not undermine one's faith in it, as long as the person is a believer and certain of the Last Day; merely having this feeling does no harm. Similarly, the inability to conceive the reality of these events and their modalities does no harm, because that is part of the Unseen, the knowledge of which Allah has kept exclusively for Himself. Ibn Taymiyyah said: "And Allah, glorified be He, does not make His servants know the realities of what He has informed them about, concerning His attributes and the attributes of the Last Day. Nor do they know the realities of what He intended by His creation and command regarding wisdom, nor the realities of what originated from Him concerning will and power." Allah Almighty has commanded us to believe in the Last Day, not to conceive its reality and how it is.