Well as an Orthodox who was previously Anglican, Lutheran, Methodist and high church Congregationalist, I find such a view incredibly ignorant and offensive, for two reasons:
Firstly, we know the Early Church was liturgical and used liturgies in manuscripts, and we know this both from the writings of the Early Church Fathers and from archaeological evidence in the form of recovered manuscripts that contain fragments of liturgical texts still in use, such as the second century Strasbourg Papyrus, which contains part of the Alexandrian Eucharistic Liturgy still used by the persecuted Coptic Orthodox Christians of Egypt, as my friend
@dzheremi will confirm, and the first century Didache, which contains a liturgical text also found as part of a Eucharistic Liturgy found in a fragment in a monastery in upper Egypt, and other ancient manuscripts of the East Syrian Eucharistic Liturgy attributed to the Holy Apostles Addai (Thaddeus) and Mari, who worked with St. Thomas the Apostle to evangelize Syria, Persia, Mesopotamia and India (specifically Kerala and the Malabar Coast, which had an Aramaic-speaking population including many Jews as a result of the establishment of trade routes to the Subcontinent by Alexander the Great).
Secondly, it remains the case that the most persecuted churches of the 20th century and at present were all liturgical churches. We are talking about those churches who suffered under militant Islam, then Communism and now once more suffer under Islam such as the Armenian Apostolic Church and the Armenian Catholic Church, the Syriac Orthodox Church, the Assyrian Church of the East, all of whom experienced genocide at the hands of the Turks, with the Armenians also being oppressed in their own land by the Soviets, and all three now being persecuted by state-sponsored terrorism and also more Turkish violence and in the case of Armenia, invasion by the Islamist regime of Azerbaijan, the aforementioned Coptic Orthodox Church, and the Orthodox Christians of Ukraine and Poland, the Ukrainian Lutheran Church, the Lutheran and Orthodox churches of the Baltic States, and in particular the Catholics and Orthodox of Albania, where the Communists under Enver Hoxha attempted, unsuccessfully, to suppress all religion, and who now experience persecution from radicalized Muslims, who have also taken over historically Christian Kosovo and engaged in terror attacks against the Orthodox Christians in Macedonia, and the Pontic Greek Christians, who like the Armenians and Syriacs were victims of genocide by the Turks followed by ethnic cleansing as a result of the population exchange between Greece and Turkey, and the Ethiopian Orthodox and Eritrean Orthodox Christians, who suffered under the Italian Fascist occupation, the Derg communist regime, and now a military dictatorship in Eritrea and Islamic persecution and martyrdom in some provinces of Ethiopia and the surrounding countries, which are fraught with ISIS activity, except for South Sudan where a civil war is killing large numbers of Anglicans. And then you have the Chinese Orthodox Church which was literally killed off in those areas captured by the PRC, such as Harbin, where one of its cathedrals survives, and Shanghai, where many of its members lived, surviving only in Hong Kong and Taiwan. Also there is the Confessing Church in Germany (the Lutherans opposed to the Nazi regime, such as the martyred pastor Dietrich Bonhoeffer), and the various Roman Catholic dioceses in the Communist countries of the Warsaw Pact, which were treated harshly by the Nazis and the Soviets after the fall of the Axis. All of these are liturgical churches, and they account for the vast majority of Christians tortured, imprisoned or killed for their faith since 1900.
So the idea that the primary mode of worship of these churches, and also the persecuted early church which suffered so much under the Roman Empire, the Persian Sassanian Empire, and later the Umayyid Caliphate and its even more brutal successor, the Fatimid Caliphate, following the rise of Islam, is ”devilish”, is unbelievably offensive and contrary to the history of Christianity as established by Patristic and Archaeological commentary. And it is equally offensive to Lutherans, Anglicans, Orthodox, Methodists, Catholics, Congregationalists and Calvinists, all of whom have used and continue to use liturgical prayer, such as the Book of Common Prayer in the case of the Anglicans.
Also, the idea that the C of E has invented its own God is preposterous, and is such an inflammatory statement that I respectfully suggest you edit your post, to remove that remark.
Regarding the people who taught you that liturgical or repeated prayer is devilish, I have to ask, who were those people? To what churches did they belong? Because I have occasionally heard of such sentiments, for example, there was resistance to the introduction of liturgical prayer in the Stone-Campbell Movement, but it happened anyway in the case of the Christian Church/Disciples of Christ, and likewise the Mormons refuse even to say the Lord’s Prayer or any repetitive prayer in their regular Sunday worship (although conversely they do have a set ritual they use in their secretive temples, which are closed to outsiders and Mormons who lack a “temple recommend”, but I don’t think they regard the fixed parts of it as prayer).