Is entering Paradise limited to repeating the supplication of Sayyid al-Istighfar, doing good deeds, and not harming others, while abandoning prayer?

If you have repented from abandoning prayer, you must strive to enumerate the missed prayers and make them up, which is the view of the majority of scholars. Some scholars, like Ibn Taymiyyah, hold that making them up is not obligatory; rather, you should perform many supererogatory prayers.

However, if you have not repented, you are committing a grave sin, for prayer is a mighty pillar and the dividing line between a Muslim and a disbeliever, as the Prophet, peace and blessings be upon him, said: "The covenant between us and them is prayer; whoever abandons it has disbelieved." Repentance is obligatory, and other deeds do not suffice for prayer.