http://www.atimes.com/article/why-ch...rs-christians/

Why China fears Myanmar’s Christians
China-backed United Wa State Party is clamping down on Christian churches, priests and missionaries in a move likely aimed to ferret out suspected US CIA-backed plots and operatives

The Chinese language statement, obtained and reviewed by Asia Times, pledges to punish any local administration cadres who support missionary activities, bans the construction of new Christian churches, and requires that priests and workers in existing churches must be local not foreign.
Hardly coincidentally, the announcement comes after John Cao, an ethnic Chinese pastor and permanent US resident of the state of North Carolina, was arrested in China in March for illegally crossing the Sino-Myanmar border. In June, he was sentenced to seven years in prison on immigration-related charges.
It is clear that China does not want a similar situation with US missionaries emerging in the neighboring Wa Hills. With Myanmar’s broad relations with the West deteriorating over the flight of some 800,000 Muslim Rohingyas into Bangladesh amid reports of abuse, China has turned the crisis into a diplomatic opportunity to regain earlier lost influence.

From that position of strength, Beijing seems keen to export its model of Christian repression into areas of Myanmar where it has sway and historical reasons to fear Western infiltration.
China also supports Burma in the UN when it veto's resolutions concerning the mistreatment of the Rohingya by Burmese security forces.