Christianity is true and all other religions and worldviews are false.
I know. I’m so close-minded. Your truth says something different. But the thing is, there is no “your truth”. There’s no my truth either. There is only the truth.
So how can I make this truth claim?
Logic, reason, and personal experience. I know the first two are not super popular these days, but stay with me.
Through the study of world religions and cults (worship cows? Hinduism, you’re outta here!), the observation of humanity viewed through history and current events, and personal witness to the truths of God’s word, there is nothing else that makes this world make sense.
These are two ways the God of the Bible has made himself known to humanity since the beginning of time:
General revelation: These are the things we see everyday that speak to the existence of God. Nature in all its beauty. Acorns programmed with all the information to turn into a mighty oak tree. The fine tuning of the universe. The incredible intricacy of a human body and the miracle of new life when men and women..well, you know. Is it not crazy our bodies can heal when we get hurt? Could even one of us create life or nature or the cosmos? Nope. So there must be a God who can, because all of those amazing things exist.
Special Revelation: The one where God reveals himself through his Word (66 books written in different countries by different people at different times yet when put together tell one cohesive story of God’s glory and his unfathomable love for us) and through miracles (things that rarely happen but when they do, occur outside of the very clear and predictable laws of nature). Specifically through that guy Jesus who shows up on the scene, validates only the Jewish religion, heals people beyond healing, and claims to be the fulfillment of Messianic prophecy. Then proves it by dying on the cross and being super duper dead for three days and then walking out of his own tomb and hanging out with the disciples for awhile before going back to heaven. Can anyone else do that (with eyewitnesses, none the less)? Buddha? No? Only Jesus? Alright then.
As if those thing weren’t enough (and they are), God is still speaking to people today. He is still doing miracles, and he is still opening the eyes of the blind and rescuing people from their depravity.
I have heard the voice of God. Just once, but, really, that’s all it takes. I have friends, both Christian and other, who have physically seen demons. I have only felt their presence (twice), but boy howdy do they exist (I promise never to say that again)! I have friends who have seen angels and I am still jealous of them. God is still upholding creation, still showing himself true as the world gets more and more delusional, still answering prayers, still appearing to people in dreams, and still preparing to come again at any moment and judge the earth. He has kept his word on everything else, so it’s a safe bet he means to keep this one, too.
You know what?
I have doubts about all of this sometimes. And that’s ok. Because when I do, I go back to the basics. I believe Jesus rose from the dead. I see the miracle of life and creation. I see the truth of the Bible as history has played out; the warring forces of evil and good, alive and well both in the world and right here in my own heart. I recall the times God has intervened miraculously in my life and the lives of my friends. Just as the Israelites built a monument to remember God parting the Red Sea, I inscribe the reality of God on paper or right here in my own little corner of the internet.
I go back to the basics: logic (there must be a Creator) , reason (the Bible tells the truth about the world and Christianity was proven true when Jesus rose from the dead), and personal experience (God has shown himself to me more times than I can count).
And that is enough for me.
Psalm 73:22-28 NLT
 I was so foolish and ignorant- I must have seemed like a senseless animal to you.  Yet I still belong to you; you hold my right hand.  You guide me with your counsel, leading me to a glorious destiny.  Whom have I in heaven but you? I desire you more than anything on earth.  My health may fail, and my spirit may grow weak, but God remains the strength of my heart; he is mine forever.  Those who desert him will perish, for you destroy those who abandon you.  But as for me, how good it is to be near God! I have made the Sovereign LORD my shelter, and I will tell everyone about the wonderful things you do. …