The time for
    prayer comes and he is in the house of a Christian person
Question

                Sometimes the time for prayer comes and
      I am in the house of one of the Christians, so I take my prayer mat and pray in front of
      them. Is my prayer valid even though I am in one of their houses?
Praise be to Allah.Yes, your prayer is valid. May Allaah make you even more keen to obey
    Him, especially with regard to performing the five daily prayers on time. It is the
    Muslim’s duty to try to pray them in congregation, and to pray them in the mosque
    whenever possible.