Yes, that is correct. Christian worship predominantly centers around Jesus and/or Mary that is directly contradictory to Islam. For example, 90%+ of the songs in Protestant hymnals are about Jesus, or the Cross. Communion is a partaking in the body and blood of Jesus either in transubstantiation or in remembrance of his life and death on the cross. Prayers are offered 'in the name of Jesus'. The Catholic 'Hail Mary' prayer worships Mary as the 'Mother of God', see also 'Our Lady of Guadalupe', 'Our Lady of Fatima', and statues of 'Madonna', etc.Having read the more recent responses in this thread, perhaps it is fair to say that it is easier for a Christian to share in Muslim practices than the other way round?
In contrast, the Islamic rituals of sawm, salah, and zakat can easily be adopted by a Christian as not being contradictory to their worship of God. For example, I believe that a Christian would have no issue with reciting in prayer surah Al-Fatiha, saying 'God is Great', 'glory to God - the Most High,' 'glory to God - the Almighty', etc. As the OP indicates partaking of the Islamic form of fasting is not inconsistent with Christian belief system, nor is giving 2.5% of one's wealth to the poor.
I venture to qualify your statement, however, that the pilgrimage to Mecca is forbidden for non-Muslims. Having been there, as Allah has willed, I can say that it is an 'other world experience' to partake in the hajj with a few million Muslims who shared my faith.
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