Hi sherah
Romans 5:12
Therefore, just as sin entered the world through one man, and death through sin, and in this way death came to all men, because all sinned—
Bear in mind the Bible uses the word man to indicate all people not just gender male.
Romans 5:17 (New International Version)
17 For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive God's abundant provision of grace and of the gift of righteousness reign in life through the one man, Jesus Christ.
At no point does the Bible indicate we need more than one person to attain perfection.