Simple. It's the work of God. He is not a God of confusion. He provides. Through faith in Him, He provides salvation. By studying His Word, He continues His work in us to further sanctify us.
Faith and belief are used by the same word in Biblical Greek (PISTIS). Wisdom (SOPHIA) and knowledge (GNOSIS) and an outward knowledge from our heart (EPIGNOSIS) is discernible from these other terms.
1Co 12:8
(8) For to one is given by the Spirit the word of wisdom; to another the word of knowledge by the same Spirit;
Lutherans originally had 5 sacraments now they have three (IIRC)
Some evangelicals believe in infant baptism, others adult only.
Some baptists are ordaining women and allowing homosexual marriage, others refuse.
Lutherans and Church of England believe in Consubstantiation, other Protestants don't believe in the real presence at all.
All of the above claim that they have arrived at these beliefs through the study of the Word.
Which ones are wrong and why?