Entire mammoths have been unearthed with food still undigested in their stomachs. Look at the Grand Canyon, it was a flood, not over millions of years. Look at where the coal and oil deposits are. Flooding placed them there. It says in the Bible, that there were no seasons before the flood. The seasons started afterward. Probably a giant asteroid hit the earth hard enough to cause it to wobble on its axis causing the seasons, and massive flooding and climate change, like tsunamis, and rain. It also says the animals were herbivores, not carnivores, before the flood. Panda bears eat bamboo, even though they are capable of digesting meat. Massive deposits of fossil animals have been found world wide indicating massive flooding. Every civilization from India, China, Middle East, Egypt, all tell of massive flooding stories.
You should not try to prove matters of faith using science, especially if you don't understand the science. For instance:
"There are scientific proofs of massive flooding all over the world." No there aren't. There are instances of localized flooding.
"Mammoths." These have been reliably dated long before any possible date for Noah's flood.
"Look at the Grand Canyon, it was a flood, not over millions of years. Look at where the coal and oil deposits are." No reputable geologist would agree with you on this.
Probably a giant asteroid hit the earth hard enough to cause it to wobble on its axis causing the seasons..." If that happened (which it did, we think, about 4 billion years ago) the impact would melt the earth into molten lava, taking millions of years to cool.
"...the animals were herbivores, not carnivores, before the flood." Hardly. Lions etc. cannot digest vegetable food. Their teeth are wrong and their intestines are too short.
