I’ve read the Bible several times in my life. And NO WHERE did I find anything suggesting the world is only 6000 years. The Bible is rather discreet about such detail. I don’t know where you Englishian speaking folks got that idea from. But I’m pretty sure those wrote these passages had a WAAAY different time measurement system than what we modern folk use right now. And who can be so sure that many details werent warpped throughout the ages through countless translations, and numerous reinterpretations between peoples?
But yes. I do believe Creationism coincides with evolution in a weird way. Just that their interpretation is rather archaic. For most ancient cultures and their religions, the world seems to be created out of something by some deity, or “hatched out of an egg” for example. To them the world is likely as old as they were able to begin counting, drawing, write, and speak. Keep records or even bothered to record in some shape or form.
They also didn’t have any concept of sciences that would include radio carbon dating and such. Many of those supposed “historical records” were often written centuries later than the supposed time of when alleged events took place, by ancient scholars told to write by their superiors. “Historical records” that contain numerous gaps in details that are often filled in with added things to the writers or their superiors’ liking. I would say the scholars had to come to a consensus on the designated date when everything allegedly began on.