Unbelievers can worship but when and if they do they cease being non-believers unless they worship their unbelief.
Because they can.
No.
qurashi
An important aspect of Jesus' worship was his engaging regularly in the disciple-making work, to the point that he was called Teacher by both believers and unbelievers. (Matt. 22:23, 24; John 3:2)
It is said in the Bible that all unbelievers go to hell. There were still believers before Jesus came because there were prophets before the time of Jesus's coming. So if there were any unbelievers, it was because they chose not to follow God.
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no
The Quran, or Koranic, verses that call for hatred and the fighting with the unbelievers are scattered throughout the Quran because the Muslims beliefs are set in stone. They believe that those who are unbelievers do not deserve the same treatment after life or during that they do.
Evangelists are people who travel to bring the good news of God to unbelievers.
abu sufyan
Christianity asserts that Jehovah (the God of Abraham) is the one true God and to recognize or worship any other gods is to deny him. All adherents to non-Abrahamic religions, they believe, are 'unbelievers' and condemned to eternal damnation.
The verse Do not yoke thyself with unbelievers means that it is unwise for a Christian to marry someone who is not a Christian. The values and lifestyles of each are very different and would tend to influence the other.