the whole Bible and not pick out the parts you want
That opens up a whole new can of worms. What Bible? Who selected it? Is there any truly ecumenical agreement on what it includes?
Somebody, somewhere back along the line of history, did pick out the parts they wanted. And today, 100s of millions of people accept that choice for themselves, rather than thinking for themselves. What the Bible says about itself (2 Tim 3:16; 2 Pet 1:20-21) is irrelevant, and tautological.