continuing . . .
Given the fact that the first century was a target rich environment for anyone wanting to blast away at false religions, we should be amazed to realize that none of those gods and deities are named and criticized in the letters of the New Testament. Criticism of wrong belief and behavior and false religion was leveled at those within the Christian community rather than at those without. The consistent proclamation from John the Baptist, to Jesus, to the apostles was God's reign. That was the Good News. They didn't start with "Zeus is false."
Could it be that all human pursuits of the divine, however misguided and fundamentally flawed, are a pursuit of God? Could this be why Paul, in his pluralistic environment, criticized flawed ideas of God instead of disparaging anyone's pursuit of God no matter how incorrectly conceived, parsed, and executed. Surely there was graciousness and generosity involved in not taking easy shots at the piety of those who aren't following Jesus.
The other side to this discussion goes beyond the way the believers we read about in scripture didn't go around tearing down other religions and shows that what they did proclaim didn't require proving other religions wrong. When the Gospel is seen as a set of propositions to be accepted, of course there must be a competition with every other set of propositions. When Christianity is reduced from a way of life to a religion of beliefs, then it has to fight with other religious ideas.
However, when the Good News is that God is near, and that He reigns, the proclamation isn't about the clash of propositions. In fact, everything doesn't hinge on those - and the Gospel can be communicated through a cup of cold water. Of course, the story of how atonement was accomplished in Jesus is part of the nearness of God's reign, but not the only part. It is not even the first part for the person whose throat is parched.