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
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.
http://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.
Unbound Bible - Collection of searchable Bibles including 10 English versions, Greek and Hebrew versions, 4 ancient versions, and 42 versions in other languages.