Selamun Aleykum,,,
Id like to answer to be be..
Be Be you assume that Allah is the name of Pagan.. Pagan were also calling their God as Allah.. yes it is true.. but Christian arabic people also call God as Allah why> because God means Allah in arabic so they basically say God but not in english but in arabic.. what led people to believe that Islam is not the right religion because they have lack of knowledge or they mislead..
If they truely search, they would come to believe in.. as Islam is the fastest growing religion in the world even though there are so many activities against Islam..