More seriously, I see gaps, discrepancies or mistranslations between 'God' as understood by Christians and 'God' as expounded by the Buddha. The fact that people use the same word doesn't mean they are talking about the same thing.
Similarly, there are gaps between 'attaining ... union with God', 'going to Heaven' as understood by Christians, and 'attaining Nibbana'.
IMO, Buddhism and Christianity match best where they talk about what it is to be a good person. Beyond that, the differences are real, significant and intractable.