At what level does the orthodox church recognize the individual rather than the collective?

A major difference between the Eastern Orthodox churches and the Baptists (since you mention them in particular) is the view of the church. Dr B. H. Carroll, the first president of Southwest Baptist Theological Seminary, wrote a paper on "Distinctive Baptist Principles", which describes the (Christian) church as

a particular congregation and not an organized denomination. ... the Baptists hold that the New Testament church is a particular congregation and not an organized denomination. According to the New Testament: “In Christ, each several building, fitly framed together, groweth into a holy temple in the Lord.” Each congregation is a complete temple in itself, and has final jurisdiction over all its affairs. (emphasis in original)

Baptist churches have a very individualist view of humanity as related to God as well, according to Dr Carroll:

This New Testament law of Christianity segregates the individual from his own family, from society with all its customs and requirements,... then isolates him from every external influence, strips him of every artificial distinction arising from wealth or poverty or social status, and then shuts him up in an exclusive circle alone with God. ... May I not seek the guidance of my priest and put on him the responsibility of interpreting this book? Nay, verily. Do thou interpret. It is God’s letter to thy soul. Thy right of private judgment is the crown jewel of thy humanity.

Finally, as far as the importance of Scripture to the church:

All the New Testament is the Law of Christianity. The New Testament is all the Law of Christianity. The New Testament will always be all the Law of Christianity.... Baptists [are] distinguished from many Protestants in rejecting the equal authority of tradition as held by the Romanists. But when Baptists say that the New Testament is the only law for Christian institutions they part company, if not theoretically at least practically, with most of the Protestant world, as well as from the Greeks [i.e. the Orthodox Church] and Romanists.

For the Orthodox Church, on the other hand, the Church is

a unique entity comprising the Revealed Truths of the Christian religion.... the whole strength of faithful and pious Christians. These people constitute the "royal priesthood" by their sanctification and dedication.

("The Fundamental Teachings of the Greek Orthodox Church", website of the Greek Orthodox Archdiocese of America)

The Church, then, is a single body, whose members are the entire population of the faithful. Orthodoxy, like Catholicism, speaks of "the People of God" in a way that Baptists would not. And this "People" have a continuous way of life, a continuous following-out of Christ's teaching, which the Church calls "Holy Tradition". This Tradition includes the Scriptures, but it goes beyond them.

Among the elements which make up the Holy Tradition of the Church, the Bible holds the first place. Next comes the Church’s liturgical life and its prayer, then its dogmatic decisions and the acts of its approved churchly councils, the writings of the church fathers, the lives of the saints, the canon laws, and finally the iconographic tradition together with the other inspired forms of creative artistic expression such as music and architecture. All of the elements of Holy Tradition are organically linked together in real life. None of them stands alone. None may be separated or isolated from the other or from the wholeness of the life of the Church.

(The Orthodox Faith, Volume I: Doctrine and Scripture, reprinted on the website of The Orthodox Church in America; emphasis added)

This last is very important. It is not simply that a statement is "checked against the Scriptures" but that it is tested by its coherence with the whole body of Holy Tradition, including the Scriptures. Because this Tradition is properly the Church's, it doesn't belong to any individual to interpret it themselves:

Jesus Christ remains forever in His Church by the Holy Spirit to open men’s minds to understand the Bible (Jn 14.26, 16.13). Only within Christ’s Church, in the community of faith, of grace, and of truth, can men filled with the Holy Spirit understand the meaning and purpose of the Bible’s holy words.

("Fundamental Teachings")

For the Orthodox Church, then, the Scriptures are not (in your words) "the sole authoritative source for knowledge about God and the practice of the faith". Rather, they are part of (the central part, but only part of) what the Church knows. And the emphasis in the Orthodox Church is not on "the individual [who] responds to the call of God and accepts the gift of salvation along with the responsibilities to the body of believers". Instead it focuses on the individual as a member of this community of faith, grace, and truth.