Wesley's Oxford friend, the evangelist George Whitefield, was also excluded from the churches of Bristol upon his return from America. Going to the neighbouring village of Kingswood, in February 1739, Whitefield preached in the open air to a company of miners. Later he preached in Whitefield's Tabernacle. Wesley hesitated to accept Whitefield's call to copy this bold step. Overcoming his scruples, he preached the first time at Whitefield's invitation sermon in the open air, near Bristol, in April 1739. Wesley wrote,
Late in 1739 Wesley broke with the Moravians in London. Wesley had helped them organise the Fetter Lane Society, and those converted by his preaching and that of his brother and Whitefield had become members of their bands. But he believed they fell into heresy by supporting quietism, so he decided to form his own followers into a separate society. "Thus," he wrote, "without any previous plan, began the Methodist Society in England." He soon formed similar societies in Bristol and Kingswood, and Wesley and his friends made converts wherever they went.
From 1739 onward, Wesley and the Methodists were persecuted by clergy and religious magistrates for various reasons. Though Wesley had been ordained an Anglican priest, many other Methodist leaders had not received ordination. And for his own part, Wesley flouted many regulations of the Church of England concerning parish boundaries and who had authority to preach. This was seen as a social threat that disregarded institutions. Clergy attacked them in sermons and in print, and at times mobs attacked them. Wesley and his followers continued to work among the neglected and needy. They were denounced as promulgators of strange doctrines, fomenters of religious disturbances; as blind fanatics, leading people astray, claiming miraculous gifts, attacking the clergy of the Church of England, and trying to re-establish Catholicism.
Whitefield inclined to Calvinism. In his first tour in America, he embraced the views of the New England School of Calvinism. When in 1739 Wesley preached a sermon on Freedom of Grace, attacking the Calvinistic understanding of predestination as blasphemous, as it represented "God as worse than the devil," Whitefield asked him not to repeat or publish the discourse, as he did not want a dispute. Wesley published his sermon anyway. Whitefield was one of many who responded. The two men separated their practice in 1741. Wesley wrote that those who held to unlimited atonement did not desire separation, but "those who held 'particular redemption' would not hear of any accommodation."