If I was going to make up a religion, it wouldn’t be Christianity. It might have something more to do with Scotch or how really important I am so everyone must pay attention to me, kind of religion!
Christianity would be the worst made up religion ever, based not on me/us, but on love and personal sacrifice, of giving of oneself without return favor and the reward for faithfulness is more work.
That is why, among the many other reasons, Christianity is not something that some guys put together in a back room to control other people, like some people have said, because what a lousy way to control people!
Instead Christianity was experienced by knowing Jesus and being with him and seeing what God what was doing.
Pastor Peter some 2,000 years ago says, For we did not follow cleverly devised myths when we made known to you the power and coming of our Lord Jesus Christ, but we were eyewitnesses of his majesty. (2 Peter 1:16)
They saw everything and it meant everything, even death, so they could share Jesus with us.
That is why for you and me, Christianity is not only about knowing things but about knowing Jesus, the real and living Jesus, who cares about you and knows you and is known back through His Word and Sacrament, through Prayer and through the Faith life of a Church family.
Christianity is not made up, it is known and experienced by knowing Jesus.