If I had let the conversation end with 'God and 'Good' I would never have discovered the truth - in our culture far more people believe in and talk about 'God' than not. The Great Divide comes when we push beyond the general and generic 'Good God' to the only way TO that 'Good God' - Jesus. We may have many 'God' things in common with a Muslim, or a Jehovah's Witness, or a Latter Day Saint - but when we push through the generalities and guide the conversation to the specific - Jesus is THE Way, THE Truth, and THE Life and no one (NO ONE) comes to the Father but through Him, When we push through to the true Gospel - we find that all things in common fall loudly to the floor.
We must let the Holy Spirit guide us and be sensitive and loving in our conversations, BUT at the same time being missional means that we understand that the focus of the mission is the Gospel of Jesus Christ. Therefore - with humility, sensitivity, and the leading of the Holy Spirit - we must learn to move beyond the comforts of 'God Talk' and wade into the dangerous, delightful, transforming waters of the Gospel!