They should not be as stipulated by Exodus 3:5 and Quran 20:12. But since western cultures have hellenized and lost contact with Middle Eastern Abrahamic roots due to antinomian heresy which looks pejoratively at commandments and focuses more on lawless hypothetical purity which does not exist in the real world. The significance of Surah Taha as explained by Prophetic descendants which mentions this commandment is that God loves Surah Taha and the one who recites Surah Taha.
https://www.quora.com/Why-are-we-allowed-footwear-inside-churches
A spiritual Ishmaelite 