This is 100% not allowed in Sikhi, such people shouldn't even be allowed to call themselves Sikhs.
Gurbani against idol worship:
[INDENT]
"The Hindus have forgotten the Primal Lord; they are going the wrong way. As Naarad instructed them, they are worshipping idols. They are blind and mute, the blindest of the blind. The ignorant fools pick up stones and worship them. But when those stones themselves sink, who will carry you across? ||2||" (Guru Granth Sahib, Ang 556)
"Within the home of his own self, he does not even come to see his Lord and Master. And yet, around his neck, he hangs a stone god. ||1|| The faithless cynic wanders around, deluded by doubt. He churns water, and after wasting his life away, he dies. ||1||Pause|| That stone, which he calls his god, that stone pulls him down and drowns him. ||2|| O sinner, you are untrue to your own self; a boat of stone will not carry you across. ||3|| Meeting the Guru, O Nanak, I know my Lord and Master. The Perfect Architect of Destiny is pervading and permeating the water, the land and the sky. ||4||3||9||" (Guru Granth Sahib, Ang 739)
"Their service is useless. Those who fall at the feet of a stone god their work is wasted in vain. ||1|| My Lord and Master speaks forever. God gives His gifts to all living beings. ||1||Pause|| The Divine Lord is within the self, but the spiritually blind one does not know this. Deluded by doubt, he is caught in the noose. The stone does not speak; it does not give anything to anyone. Such religious rituals are useless; such service is fruitless. ||2||" (Guru Granth Sahib, Ang 1160)
"You wash your stone gods and worship them. You offer saffron, sandalwood and flowers. Falling at their feet, you try so hard to appease them. Begging, begging from other people, you get things to wear and eat. For your blind deeds, you will be blindly punished." (Guru Granth Sahib, Ang 1240)
"Meeting God, doubt is dispelled. Who else should I worship? I can see no other. ||3|| One stone is lovingly decorated, while another stone is walked upon. If one is a god, then the other must also be a god. Says Naam Dev, I serve the Lord. ||4||1||" (Guru Granth Sahib, Ang 525)
"The performance of countless millions of other devotions is not even equal to one devotion to the Name of God" (Guru Granth Sahib, Ang 1163)
"Those who serve Shiva and Brahma do not find Salvation. The Fearless, Formless Lord is invisible; He reveals Himself only to the Gurmukh. United with God, one does not suffer from sorrow or separation; he becomes stable in the world" (Guru Granth Sahib, Ang 516).
"I do not pick leaves as offerings and I do not worship idols. All services are useless without devotional worship of the Lord"(Guru Granth Sahib, Ang 1158)
"God does not reside within the statue of Krishna"(Guru Granth Sahib, Ang 727) [/INDENT]
Now let's hear from the Dasam Granth:
[INDENT]"So what if you worshipped statues, monuments or pictures? Worshipping these, your soul has been tired (meaning you are close to death) but you have not found anything. You donate rice, you burn joss-stick, wick lamps or frankincense, you burn oil lamps and perform many other rituals but that statue does not get you anything because it has no life. You fool! What do you get out of performing these rituals? What can a stone give you? If this stone had life, then it would have been able to give you something. Think this over and start reciting God’s praises, then you will know the right path and you will know that without God, you cannot get away from this cycle of birth and death"
"While worshipping stones some people are bowing before them and some others are withholding idols of stones in their necks. Some people have faith that God is in the south while others consider God is toward the west and they are bowing their heads in those directions. Some people are worshiping idols foolishly while others are adoring the dead. The whole world is busy in such false performances without knowing the secret mystery of God."
"O foolish beast! You do not recognize Him, Whose Glory hath spread over all the three worlds (refering to life in the sea, land and air). You worship the creatures of God, on account of which your future (in the yond) is lost. For self interest you do such sin that even then great sin is ashamed of that. O ignorant, fall at the feet of the Lord. God does not reside in these stones."
"Why do you worship stones? The Lord-God is not within those stones; you may only worship Him, whose adoration destroys clusters of sins; with the remembrance on the Name of the Lord, the ties of all suffering are removed; ever mediate on that Lord because the hollow religious will not bear any fruit."
"The hollow religion became fruitless and O being! You have lost millions of years by worshipping the stones; you will not get power with the worship of stones; the strength and glory will only decrease; In this way, the time was lost uselessly and nothing was achieved and you were not ashamed; O foolish intellect! You have not remembered the Lord and have wasted your life in vain."
"I (Guru Gobind Singh) have killed the hill kings who were bent on mischief. They were stone idol worshippers, I am the breaker of idols and I worship the one Lord."
"They who think that Shiva is God, they are unaware of the Supreme Primal Lord" [/INDENT]
Historical texts written by non-Sikhs also declare that Sikhs were not idol worshippers. For example, the Dabistan-i-Mazahib, written by a Muslim Mullah called Mohsin Fani Kashmiri, states that:
[INDENT]"Followers of Guru Nanak (Sikhs) do not have faith in idols and temples of idols. The Sikhs are not idol worshippers. The greatest proof of that is that none of the Gurus raised any temple where an idol was installed."[/INDENT]