2 Timothy 3:14-17 says, "But as for you, continue in what you have learned and have become convinced of, because you know those from whom you learned it, 15 and how from infancy you have known the Holy Scriptures, which are able to make you Wise For Salvation through faith in Christ Jesus. 16 All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, 17 so that the servant of God may be thoroughly equipped for every good work."
These verses outline the foundation we wish to build upon and it is the same foundation Paul was instructing young Timothy to build upon, the foundation of God's word.
God's word establishes the core of our beliefs, doctrines, and theology. We approach God's word as having a superior authority to social norms, media propaganda, personal preference, and all other written texts throughout human history.
The bible is the final authority. From Genesis to Revelation it is God's special revelation to mankind. It is more than a history book. It is more than a religious book. It is God's word spoken to us. It has the authority to establish every belief of our life. And we believe it has not, is not, and will not ever change.
We believe Jesus Christ is the only hope for salvation. He came down from heaven and become a man, born of a virgin, lived a perfect life without sin, went willingly to the cross, died for our sins, and rose from the dead on the third day. And we believe that every person who believes in Him will also experience a resurrection from the dead.
Therefore, every Christian ought to live out the faith and look different from the world. We are to be a community of believers striving every day to live as close to Jesus as we possibly can. To walk in the Spirit and work wholeheartedly to fight off the flesh. Theology and doctrine are not enough. We must have obedient lifestyles, and give grace by knowing that all of us are a "work in progress". Some of us have farther to go than others, but none of us has arrived.