It says religions are different (maybe in disagreement with each other) and yet there is the One in them and their goal is that One.
I think the Shabad points out to different ways people are trying to reach God, and how God Himself is the controlling factor in what is revealed and what is not! God reveals and it is up to you to ask for more, more visions and wisdom from God. E.g. in the first of line of this Shabad, the Persian word
Khwdai (خدای) means Lord, Master, Ruler etc and the word Ram means Ramya hoya, i.e. ਸਰਬ ਵਿਆਪੀ, so Guru Sahib is saying that God is one Ruler who is part of his Kingdom. Not like kings of ol' who went about in charriots, atop elephants or VIP of today who go about in car fleets.
ਰਾਮਕਲੀ ਮਹਲਾ ੫ ॥
Raamkalee, Fifth Mehl:
ਕੋਈ ਬੋਲੈ ਰਾਮ ਰਾਮ ਕੋਈ ਖੁਦਾਇ ॥
Some call Him, 'Raam, Raam', and some call Him, 'Khudaa-i'.
ਕੋਈ ਸੇਵੈ ਗੁਸਈਆ ਕੋਈ ਅਲਾਹਿ ॥੧॥
Some serve Him as 'Gusain', others as 'Allaah'. ||1||
ਕਾਰਣ ਕਰਣ ਕਰੀਮ ॥
He is the Cause of causes, the Generous Lord.
ਕਿਰਪਾ ਧਾਰਿ ਰਹੀਮ ॥੧॥ ਰਹਾਉ ॥
He showers His Grace and Mercy upon us. ||1||Pause||
ਕੋਈ ਨਾਵੈ ਤੀਰਥਿ ਕੋਈ ਹਜ ਜਾਇ ॥
Some bathe at sacred shrines of pilgrimage, and some make the pilgrimage to Mecca.|
ਕੋਈ ਕਰੈ ਪੂਜਾ ਕੋਈ ਸਿਰੁ ਨਿਵਾਇ ॥੨॥
Some perform devotional worship services, and some bow their heads in prayer. ||2||
ਕੋਈ ਪੜੈ ਬੇਦ ਕੋਈ ਕਤੇਬ ॥
Some read the Vedas, and some the Koran.
ਕੋਈ ਓਢੈ ਨੀਲ ਕੋਈ ਸੁਪੇਦ ॥੩॥
Some wear blue robes, and some wear white. ||3||
ਕੋਈ ਕਹੈ ਤੁਰਕੁ ਕੋਈ ਕਹੈ ਹਿੰਦੂ ॥
Some call themselves Muslim, and some call themselves Hindu.
ਕੋਈ ਬਾਛੈ ਭਿਸਤੁ ਕੋਈ ਸੁਰਗਿੰਦੂ ॥੪॥
Some yearn for paradise, and others long for heaven. ||4||
ਕਹੁ ਨਾਨਕ ਜਿਨਿ ਹੁਕਮੁ ਪਛਾਤਾ ॥
Says Nanak, one who realizes the Hukam of God's Will,
ਪ੍ਰਭ ਸਾਹਿਬ ਕਾ ਤਿਨਿ ਭੇਦੁ ਜਾਤਾ ॥੫॥੯॥
knows the secrets of his Lord and Master. ||5||9||
Guru Sahib also talk about people recognizing God with different places and different forms of clothing. The followers call themselves with different names, but don't know the secrets of God.
I am particularly interested in how you argue that visions of God are different.<!-- google_ad_section_end -->
I don't think that visions of God in completeness are different. But most people see God in some things and don't in others. Some see God in their love for children, some love their pets and thank God for their company. Some think about God while going for a walk and seeing the nature beauty all around them. It is a bit about how your senses are heightened to experience God. You experience God more when you try to connect with God more, like you said, using Naam.