Paul the Apostle told the Corinthians that IF Christ be not risen we are liars preaching a false message. (1Cor. 15)
Christianity BEGINS with the claim of a miracle (the resurrection), without such, christianity is just another works based religion seeking to relate to God via some code of conduct.
IF the resurrection is true, then this objective fact of history becomes the most amazing event of all time. IF true, it validates everything Jesus said to be objective truth because He predicted His own death and resurrection. IF true, this then validates every Old Testament quote by Christ to be true, which includes quotes from Genesis, Isaiah, Jonah etc.etc.
If a person can believe Jesus rose from the dead, then it should be no problem believing the miracle claims of Genesis, Isaiah, and Jonah.