American Religion Data Archive - Data on churches and church membership, religious professionals, and religious groups (individuals, congregations and denominations) ; national, state, county, and metro area; search function available.
Center on Religion and Democracyhttps://theird.org/ - Politically non-partisan research center ; committed to addressing the complex relationship between religion and democratic culture ; impressive library of online texts
Christian Classics Ethereal Library - Selected by theologians and ministers from a variety of Christian traditions, to cover important topics for theological study and edification
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Christian Sacred Texts - The scriptures, early Christian and Gnostic texts, renaissance and reformation texts, and modern texts online.
Codex Sinaiticus - Handwritten well over 1600 years ago, this manuscript contains the Christian Bible in Greek, including the oldest complete copy of the New Testament.
CyberHymnalhttp://www.hymntime.com/tch/ - Searchable site includes thousands of Christian hymns & Gospel songs from many denominations, lyrics, MIDI files, scores, pictures, and history.
Internet Sacred Text Archive - Largest religious text archive on the Internet; an astounding resource on religion, mythology, legend, folklore, and esoteric topics.
Religious Literacy Project - Harvard University - The Religious Literacy Project at Harvard Divinity School advances the public understanding of religion with special attention to power, peace, and conflict. Through resources and training for educators and other professionals they explore the complex role religions play in society.
Unbound Bible - Collection of searchable Bibles including 10 English versions, Greek and Hebrew versions, 4 ancient versions, and 42 versions in other languages.