There are plenty who "identify" as Christians, who are in fact not true followers of Christ. So, there are some who call themselves Christian and yet claim the flood was localized, and even some who say it is allegory.
True history is not dependent upon whether or not anyone believes it. In the same way the Bible is the true word of the living God, whether or not you believe now. The account of the flood in the Bible is accurate history. The 8 people and the animals with them on the ark, were the only land dwelling creatures to survive.
There is plenty of evidence for it in the world today. You will find billions of dead things (fossils) buried in rock layers, laid down by water all over the earth. Marine fossils are found on the peaks of the highest mountains. Creating a fossil requires rapid burial, otherwise a dead creature will be eaten or decay in a very short time.
If you are truly interested in finding out more, I recommend these websites: creation.com & answersingenesis.com
Thought I had tagged it with the shitpost flair - but I guess it didn't stick. It's fixed now.