Isn't faith just believing without evidence?
Not in the Bible. Faith is trust grounded in reasons; the apostles pointed to what they had seen and invited people to check.
Luke wrote so that his reader would know the certainty of what he had been taught. Jesus showed Himself alive with many proofs. Christians are commanded to give a reason for their hope.
4that you might know the certainty concerning the things in which you were instructed.
Luke 1:4 (WEB) · context
3To these he also showed himself alive after he suffered, by many proofs, appearing to them over a period of forty days and speaking about God’s Kingdom.
Acts 1:3 (WEB) · context
15But sanctify the Lord God in your hearts. Always be ready to give an answer to everyone who asks you a reason concerning the hope that is in you, with humility and fear,
1 Peter 3:15 (WEB) · context
Why the evidence matters
If Jesus rose, His offer is real
God loves you and gave His Son so that whoever believes in Him should not perish.