Not in the bible = Not true?

I was speaking with someone who stated that if a teaching isn’t in the Bible, the church made it up and is simply man made.

This is a common problem among certain mainline or non-affiliated Christian communities. It is important to remind them that without a Tradition there is no Bible, as the Bible was assembled by the faith community based upon the Traditions. Here are some additional references that are in the Bible: 1 Cor 11:2 “Hold fast to traditions I handed on to you”; 2Thes 1:15 “hold fast to traditions, whether oral or by letter”; 2Thes 1:15 “Shun those acting not according to tradition”; Jn 21:25 not everything Jesus said is recorded in Scripture.