A couple of days ago, I saw an article on the BBC that said that the numbers of migrants trying to get through the Channel Tunnel had fallen from a peak of 2000 per night to just 200 per night. The UK government proudly put this down to the construction of more fences and the deployment of more guard dogs.
The construction of fences and the formation of "fortress Britain" seems to me, not only to be an admittance of abject failure to deal with the underlying problem but also utter rejection of the Gospel of Jesus Christ. Ephesians 2:11-22 says that the Gospel of Christ, not only reconciles us with God but also with one another. Natural enemies [Jews and Gentiles] are made one by Christ.
remember that formerly you who are Gentiles by birth and called ‘uncircumcised’ by those who call themselves ‘the circumcision’ (which is done in the body by human hands) – 12 remember that at that time you were separate from Christ, excluded from citizenship in Israel and foreigners to the covenants of the promise, without hope and without God in the world. 13 But now in Christ Jesus you who once were far away have been brought near by the blood of Christ. 14 For he himself is our peace, who has made the two groups one and has destroyed the barrier, the dividing wall of hostility, 15 by setting aside in his flesh the law with its commands and regulations. His purpose was to create in himself one new humanity out of the two, thus making peace, 16 and in one body to reconcile both of them to God through the cross, by which he put to death their hostility. 17 He came and preached peace to you who were far away and peace to those who were near. 18 For through him we both have access to the Father by one Spirit. 19 Consequently, you are no longer foreigners and strangers, but fellow citizens with God’s people and also members of his household, 20 built on the foundation of the apostles and prophets, with Christ Jesus himself as the chief cornerstone. 21 In him the whole building is joined together and rises to become a holy temple in the Lord. 22 And in him you too are being built together to become a dwelling in which God lives by his Spirit.
To divide people in order to protect one group from the other is attempting to oppose what God is doing in Christ.
Additionally, Peter Sutherland of the UN commission on international migration said any country that thought it could stop the "alleged floods" of people with fences was "living in cloud cuckoo land". Apparently the UK should be renamed.