In fact, according to Islamic doctrine, violent jihad the the ONLY assurance to gain entry to Paradise.
Nope.
And hasten to forgiveness from your Lord and Jannah, as wide as the heavens and the earth; it is prepared for those who keep their duty: Those who spend in ease as well as in adversity and those who restrain anger and pardon men. And Allah loves the doers of good. And those who, when they commit an indecency or wrong their souls, remember Allah and ask forgiveness for their sins. And who forgives sins but Allah? And they persist not knowingly in what they do. Their reward is protection from their Lord, and Gardens wherein flow rivers, to abide in them. And excellent is the reward of the workers! - 3:133-136
And certainly Allah made a covenant with the Children of Israel, and We raised up among them twelve chieftains. And Allah said: Surely I am with you. If you keep up prayer and pay the poor-rate and believe in My messengers and assist them and offer to Allah a goodly gift, I will certainly cover your evil deeds, and cause you to enter Gardens wherein rivers flow. But whoever among you disbelieves after that, he indeed strays from the right way. - 5:12
Surely those who believe and those who are Jews and the Sabeans and the Christians -- whoever believes in Allah and the Last Day and does good -- they shall have no fear nor shall they grieve. - 5:69