But you can't prove any of it. So, I take offense to you using the word "true" so lightly.
Proof of God is the world we live in. We are on a planet at just the right distance from the Sun. Any farther or closer and we would be on an uninhabitable planet.
But that's not all. God has made Himself real to me, I can't disprove that.
If you want to seek God to prove or disprove His existence, you are free to do that. But Christianity isn't about a life of proving and disproving His existence, it's about having a personal relationship with God because He loves you and sent His only Son, Jesus, to die for your sins.
There are going to be a lot of unanswered questions in life that we live: dinosaurs, human eyes able to focus on things close and far at the same time, why your relative so-and-so died so early, a shark's sixth sense, why Miss so-and-so dumped you, etc. And just because you accept Christ, doesn't mean you automatically get all the answers from God.
But what I will do is pray for you that God will make Himself so real to you, that you can't deny His existence and more importantly, have a personal relationship with God.