ASLAAM U LAIKUM PROUD MUSLIM ,
firstly its great to know about your interest in theology in particularly SIKHISM , and sorry for delay in reply .
i will try to answer your question with my little understanding ,
1 Do you believe Sikhism is a successor of the other Abrahamic faiths? I know it is listed as Dharmic religion but the more i read about it, its monotheism and teachings seem very similar to the Abrahamic faiths.
Sikhism is a monotheist way of life , but it differ from ABRAHMIC philosphy .
acc to Sikhi CREATOR IS NO DIFFERENT from its creation but in Abrahmic faiths
creator is in a HEAVEN ,
[SIZE=+1][SIZE=+1]Mėhlā 5.[/SIZE]
[SIZE=+1]Fifth Mehl:[/SIZE]
[SIZE=+1]Farīḏā kẖālak kẖalak mėh kẖalak vasai rab māhi.[/SIZE]
[SIZE=+1]Fareed, the Creator is in the Creation, and the Creation abides in God.[/SIZE]
[SIZE=+1]Manḏā kis no ākẖī▫ai jāʼn ṯis bin ko▫ī nāhi. ||75||[/SIZE]
[SIZE=+1]Whom can we call bad? There is none without Him. ||75||[/SIZE]
[/SIZE]
IN abrahmic faiths after physical death of the body , we will be able to experience / saw GOD .
but in Sikhi this present moment is everything and who is not living this moment wanders insanely
[SIZE=+1]Mėhlā 3.[/SIZE]
[SIZE=+1]Third Mehl:[/SIZE]
[SIZE=+1]Gẖar hī mėh amriṯ bẖarpūr hai manmukẖā sāḏ na pā▫i▫ā.[/SIZE]
[SIZE=+1]The home within is filled with Ambrosial Nectar, but the self-willed manmukh does not get to taste it.[/SIZE]
[SIZE=+1]Ji▫o kasṯūrī mirag na jāṇai bẖarmaḏā bẖaram bẖulā▫i▫ā.[/SIZE]
[SIZE=+1]He is like the deer, who does not recognize its own musk-scent; it wanders around, deluded by doubt.[/SIZE]
[SIZE=+1]Amriṯ ṯaj bikẖ sangrahai karṯai āp kẖu▫ā▫i▫ā.[/SIZE]
[SIZE=+1]The manmukh forsakes the Ambrosial Nectar, and instead gathers poison; the Creator Himself has fooled him.[/SIZE]
[SIZE=+1]Gurmukẖ virle sojẖī pa▫ī ṯinā anḏar barahm ḏikẖā▫i▫ā.[/SIZE]
[SIZE=+1]How rare are the Gurmukhs, who obtain this understanding; they behold the Lord God within themselves.[/SIZE]
[SIZE=+1]Ŧan man sīṯal ho▫i▫ā rasnā har sāḏ ā▫i▫ā.[/SIZE]
[SIZE=+1]Their minds and bodies are cooled and soothed, and their tongues enjoy the sublime taste of the Lord.[/SIZE]
[SIZE=+1]Sabḏe hī nā▫o ūpjai sabḏe mel milā▫i▫ā.[/SIZE]
[SIZE=+1]Through the Word of the Shabad, the Name wells up; through the Shabad, we are united in the Lord's Union.[/SIZE]
[SIZE=+1]Bin sabḏai sabẖ jag ba▫urānā birthā janam gavā▫i▫ā.[/SIZE]
[SIZE=+1]Without the Shabad, the whole world is insane, and it loses its life in vain.[/SIZE]
[SIZE=+1]Amriṯ eko sabaḏ hai Nānak gurmukẖ pā▫i▫ā. ||2||[/SIZE]
[SIZE=+1]The Shabad alone is Ambrosial Nectar; O Nanak, the Gurmukhs obtain it. ||2||[/SIZE]
2Do you believe Guru Nanak and the following 9 Gurus were also prophets/messengers of God?
my signature says it all, the following lines are also from our Holy text GURU GRANTH SAHIB JI
ਸਮੁੰਦੁ ਵਿਰਲਿ ਸਰੀਰ ਹਮ ਦੇਖਿਆ ਇਕ ਵਸਤੁ ਅਨੂਪ ਦਿਖਾਈ ॥
Churning the ocean of the body, I have seen the incomparable thing come into view.
ਗੁਰ ਗੋਵਿੰਦੁ ਗਵਿੰਦੁ ਗੁਰੂ ਹੈ ਨਾਨਕ ਭੇਦੁ ਨ ਭਾਈ ॥
The Guru is God, and God is the Guru, O Nanak; there is no difference between the two, O Siblings of Destiny:
3Do you believe in Heaven/Hell and afterlife?
Regarding after life Sikh belevive that our aim of life is to became one with lord and one true Sikh reaches the stage where one says " I AM YOU ", regarding heaven /hell GURU says
Kavan narak ki▫ā surag bicẖārā sanṯan ḏo▫ū rāḏe.
[SIZE=+1]What is hell, and what is heaven? The Saints reject them both.[/SIZE]
Ham kāhū kī kāṇ na kadẖ▫ṯe apne gur parsāḏe. ||5||
[SIZE=+1]I have no obligation to either of them, by the Grace of my Guru. ||5||[/SIZE]
Now, I have mounted to the throne of the Lord; I have met the Lord, the Sustainer of the World.
Rām kabīrā ek bẖa▫e hai ko▫e na sakai pacẖẖānī. ||6||3||
[SIZE=+1]The Lord and Kabeer have become one. No one can tell them apart. ||6||3||[/SIZE]
I will answer your rest questions also , plz forgive me i am too busy ,i will answer tomorrow , feel free to ask anything about SIKHI .
THANX