Dubs,
I know many Sikhs who are monotheists but think that their way of worshipping God is only one of the valid ways of doing so.
I agree with your logic mostly but it does not imply what religion claims.
The way of worshiping anything has nothing to do with the validity of the worship.
Those who think that as long as you are spiritual, it doesn't matter which god you worship, are just being duped.
Any religion is a practice of fraud which exploits spirituality(or what we don't know yet) to make people do what they want them to do.
Monotheism is something we human invented, it was always many gods before.
With time our leaders saw it more fitting to have one god = one leader.
They just changed the religion according to their needs.
I must have misread... I took: 'If you believe in a religion, you have to give it your complete obedience.' to suggest that you thought monotheism implied particularism.
Monotheism does not imply particular-ism, but religion itself does. Since what ever god says, is right by definition. So if you claim to believe in any god, then you must obey everything he says including all the particulars.
So if god says that all those who work on Sunday must be put to death for breaking one of the sacred commandments all theists that are either:
a. Islam
b. Christianity
c. Judaism
Must kill those people else they are not true believers but hypocrites.
Well all believers are hypocrites with themselves and others by definition. The ones that weren't we put them in jail or the electric chair since we call them terrorists.