Even the Catholic scholar Raymond Brown says Romans 9.5 is ambiguous. Why does the Trinity doctrine so regularly fall back on texts that are uncertain textually or grammatically?
PetrW thanks for an interesting exposition about non-adorative Christology and the reference to the early Unitarian Ferenc David.
Yet the NT is very clear that Christians should pray to God alone. Jesus instructed his followers to pray to the Father (the one exception, again, is textually in dispute at John 14.14) and the evidence from Paul and the other NT writers is that they followed this instruction. Christians are to pray to God through Jesus and in his name. The German scholar Hans Conzelmann put it this way:
“Calling on Jesus is to be distinguished from prayer. Only God is worshipped. But that one can pray at all is a miracle, mediated through the Lord. Consequently men call upon him; they pray in the name of the Lord.” An Outline of the Theology of the New Testament (1969), page 84.
I also note that there are Trinitarians who in practice agree that prayer is correctly directed to God through Jesus rather than to Jesus himself. For example I have often observed, and had it confirmed from speaking to them, that the Brethren, despite being fully Trinitarian, strictly follow the Bible pattern of prayer to God through Jesus rather than prayer direct to Jesus.