Now faith is the substance of things hoped for, the evidence of things not seen.
1 Peter 3:15-16:
But in your hearts set apart Christ as Lord. Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect, keeping a clear conscience, so that those who speak maliciously against your good behavior in Christ may be ashamed of their slander.
Dear friends, although I was very eager to write to you about the salvation we share, I felt I had to write and urge you to contend for the faith that was once for all entrusted to the saints.
Christianity is a defensible faith, it isn’t necessarily blind like so many people claim. It can be defended in many different fields of science, history and philosophy.
But we must always be careful to follow the words of Christ when we are dealing with people on this very touchy subject,
Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves.
I don’t know how many times I have encountered Christians, or at least people claiming to be Christian, that were speaking the truth that were so mean and arrogant that the truth sounded like a lie. Most of the time we MUST be gentle with people. There are a few exceptions like when someone’s life is in danger, and nice is not working. exp: a drunk getting behind the wheel of a car loaded with kids that are not wearing seat belts. Another case when it may be OK to be a bit rude is when a Christian teacher is teaching doctrines that go against the basic tenants of the Christian faith, and you have elders in the church backing you up, if you have tried gentleness and wisdom and that teacher is still teaching your weaker Christian brothers and sisters wrong teachings then being as rough as you need to be to keep him from corrupting the rest of the congregation may be called for. But you will be able to lure a lot more people to the foot of the cross if you are gentle with them.”