Hmm. Interesting. Although I suspect Muslims are more likely to find Christian beliefs & practices a stumbling-block than vice versa.

For the record, Christian churches generally are open to those of all faiths and of none, to attend services or other events, offer private prayer, or just find a bit of peace and quiet. The only restriction is on full participation in the Eucharist. And anybody, "heretic, Turk or Jew", can have a parish church wedding if they satisfy the legal requirements.

OTOH in the C of E, canon law allows only the officially permitted forms of worship. Mind you, Common Worship, unlike the Book of Common Prayer, gives vicars quite a lot of leeway to construct occasional services when necessary.