Logically - I suppose the first Gods would have been of the Sun, Water and the Earth (as in soil) - followed swiftly by fertility and other social necessities when man became a herder rather than hunter ending with the numerous collection of Gods of the hindus/egyptians/greeks/romans et al.
It seems that the Jews were the first to parcel this little bunch up into one all knowing "Almighty".
Next comes Jesus teaching to the poor and underpriveleged who because he made a bit of an impact was quickly hi-jacked by the "noble and wise". (I think the highest socially ranked actual desciple was the Tax Collector, wasn't he? ). As this Jesus had probably been dead for 2 or 3 hundred years they needed an "Image".
Luckily, by this time the Romans had taken dominance over the Greeks so the hi-jackers noticing a handy load of golden coloured statues around the place - left by the greeks - mounted then on Crucifixes and Hey Presto.
Small addendum to this story : These statues were of Helios the Sun God - hence your nice little "halo".
Next on the scene is Mohamed ( c.5 A.D.? Not sure and not interested enough to look up the exactities). Who believes in Jesus and his works - but only as a prophet. - He has seen what an unholy debacle the christians have made of things (The rift between RC and Orthodox) and goes back to just one "God". He in turn is declared a prophet and the Muslims are born.
(I'm not 100% sure of the Muslim story and any input by a believer is welcome)
The Christian Church in the meantime plodded on gloriously and became the domain of the aristocracy. ( 1st Son takes over the estates/titles etc; -
2nd Son goes to the Military and if there's a 3rd Son, he goes to the church and depending on Daddy's Rank becomes a Bishop, Archbishop or Cardenal).
I presume this could have been another reason for the rising of the Protestants who... (sorry about the next bit but can't resist the temptation) begat Lutherans, who begat Methodists, who begat Baptists, who begat... and so it went (and goes) on. Think of a clever twist and all you need is someone gullible to believe you and away you go - after all according the British author and traveller Capt. Marryat, who was around at the time, one of the originators of the Mormons was a convisted con artist. Sorry I can't remember which one but it is over 30 years since I read the book.
Finally, the Second Coming. He had better get his dates right, because if he came back now they would lock him up as a raving junky/pot head/crack head etc: Even if he'd arrived in McCarthy's time he'd have been locked up as a raving Commy.
Anyway a final message to you miriads of believers in miriads of religions who have all got one thing in common - only YOU and the believers in YOUR particular sect are going to enter the "Gates of Heaven". Ahhhh! If only your beliefs were true - I would love the see the faces of all those who had been paying their 10% to the Church and got the wrong one!!
Me?? - If you lot are right?? - I'll just pick up my shovel and head on down to the stoke hole with the rest of my pals. It would drive me crackers up there with you lot quoting religion all day.
So - Why am I posting in the Religion Section?? Like you I have also seen the light and am trying to show you the error of your ways. (and save you some time and money into the bargain - after all - I don't pass around the collection tray after my Sermon:D