I am a pagan. There are pretty much no widely accepted texts within paganism that make any statements about subject. In my experience most pagans are quite happy to coexist with other religions in general - and given that in almost all circumstances pagans will be in a small minority that makes perfect sense. On the other hand, most pagans that I know are far less happy to coexist with the more bigoted and hateful varieties of religion.

There is a strong feminist trend within paganism and this - particularly linked with the ahistorial but often assumed heritage of witchcraft, and the associated history of hanging and burning of witches - does not lead the more patriarchal end of the Abrahamic religions to sit well with a lot of pagans - and I know a lot who are far happier about visiting the roofless moss-covered shell of an abandoned church, with a hawthorn growing in the apse than they are visiting an occupied one (unless it is in search of a sheel-na-gig etc).

On the other hand, there is a strand of Norse paganism that crosses into white supremacy and neo-nazism, so that brings its own hate, bigotry and patriarchy. I do not know what their stance on other religions is.

“No God before me” can have, and does have in the history of Christianity, three possible interpretations.

• the exclusivist one (Evangelical churches mainly): the Christian God is the only God, you have to confess him directly to be saved.
• the inclusivist one (mainly the Catholic church, and some Protestants), the Christian God is the only God, but you can unknowingly pray him when you pray an other God within other traditions, in other words you can be Christian without knowing it.
• the pluralistic one (other Protestants), most religions are equally valuable, but if you are Christian you should pray only the Christian God.

Of course this is just a model, all positions are deeper than that and most people mix two or even the three models. I don’t know where the Orthodox Churches stand.

For myself, I tend to be somewhere between the second and the third model.