Faith comes from reading and understanding the word of God.
Romans 10:17 So then faith cometh by hearing, and hearing by the word of God.
Blind faith is of no value. It is the scriptures which make us wise unto salvation.
2 Timothy 3:15 And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus. 16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: 17 That the man of God may be perfect, throughly furnished unto all good works.
Faith is built on understanding the scriptures.
Jesus taught his disciples by reasoning from the scriptures
Luke 24:27 And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself.
The result was that they were enthused with understanding.
Luke 24:32 And they said one to another, Did not our heart burn within us, while he talked with us by the way, and while he opened to us the scriptures?
When we know why we believe the gospel of the kingdom of God, we should be able to explain it to others using the scriptures.
1 Peter 3:15 But sanctify the Lord God in your hearts: and be ready always to give an answer to every man that asketh you a reason of the hope that is in you with meekness and fear:
Paul reasoned from the scriptures:
Acts 17:2 And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures,
Acts 18:4 And he reasoned in the synagogue every sabbath, and persuaded the Jews and the Greeks.
Acts 18:19 And he came to Ephesus, and left them there: but he himself entered into the synagogue, and reasoned with the Jews.
Acts 24:25 And as he reasoned of righteousness, temperance, and judgment to come, Felix trembled, and answered, Go thy way for this time; when I have a convenient season, I will call for thee.
Acts 28:23 And when they had appointed him a day, there came many to him into his lodging; to whom he expounded and testified the kingdom of God, persuading them concerning Jesus, both out of the law of Moses, and out of the prophets, from morning till evening.
The Bereans had the correct approach:
Acts 17:11 These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so.
Philip and the Eunuch is a worked example:
Acts 8:30 And Philip ran thither to him, and heard him read the prophet Esaias, and said, Understandest thou what thou readest? 31 And he said, How can I, except some man should guide me? And he desired Philip that he would come up and sit with him. 32 The place of the scripture which he read was this, He was led as a sheep to the slaughter; and like a lamb dumb before his shearer, so opened he not his mouth: 33 In his humiliation his judgment was taken away: and who shall declare his generation? for his life is taken from the earth. 34 And the eunuch answered Philip, and said, I pray thee, of whom speaketh the prophet this? of himself, or of some other man? 35 Then Philip opened his mouth, and began at the same scripture, and preached unto him Jesus. 36 And as they went on their way, they came unto a certain water: and the eunuch said, See, here is water; what doth hinder me to be baptized? 37 And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God. 38 And he commanded the chariot to stand still: and they went down both into the water, both Philip and the eunuch; and he baptized him.
I hope this helps.