Christian denominations value "Having a strong community, being serious about following the Bible and leading a Christian life and a commitment to modesty". The Beachy Amish, many of whom conduct their services in English and allow for a limited range of modern conveniences, regularly receive seekers into their churches as visitors, and eventually, as members. Becoming a member involves a proving period and a study of the Dordrecht Confession of Faith (1633). Evangelical Christianity Evangelical Protestants do not consider baptism to be necessary for salvation. Because of this, instead of baptism, a person becomes a Christian the moment they profess Jesus as their Lord and Savior. Evangelicals base this off of their interpretation of certain verses in the Bible. This may be expressed at some Evangelical church services where the Pastor may conduct an "altar call", inviting non-Christian persons to go up publicly and "receive" Jesus into their hearts to become Christian. As a result of this belief, many Evangelicals do not practice infant baptism and from this they profess one must be able to make the decision on their own to convert to Christianity; other Evangelicals, such as Methodists, practice infant baptism as a celebration of prevenient grace. Nevertheless, all Evangelicals recognize the form of believer's baptism as a public pronouncement of faith in Christ. Conversion from other religions According to a 2001 study by professor David B. Barrett of Columbia University and historian George Thomas Kurian, approximately 2.7 million people were converting to Christianity annually from another religion, while approximately 3.8 million people were converting annually according to The Oxford Handbook of Religious Conversion. Pentecostalism is the fastest growing religion in the world; this growth is primarily due to religious conversion from non-Christian religions and Christians switching denominations. According to scholar Philip Jenkins, Christianity is growing rapidly in China, other Asian countries, and sub-Saharan Africa. According to a study by a scholar Fenggang Yang from Purdue University, Christianity is "spreading among the Chinese of South-East Asia", and "Evangelical and Pentecostal Christianity is growing more quickly in China"; more than half of them have university degrees. According to a report by the Singapore Management University, an increasing number of people in Southeast Asia are converting to Christianity, and these new converts are mostly Chinese business managers. According to scholar Juliette Koning and Heidi Dahles of Vrije Universiteit Amsterdam, there is a "rapid expansion of charismatic Christianity from the 1980s