Philemon 1:3

‘Grace to you (P) and peace from God our Father and the Lord Jesus Christ.’

Here the pronoun is in the plural. The whole church is included in the greeting. It is a standard greeting of Paul with charis (grace) being similar to the typical Gentile greeting whist shalom (peace, well-being) was the typical Jewish greeting. Note the regular ‘God our Father and the Lord Jesus Christ’. ‘God’ and ‘Lord’ were both titles of deity, coming directly from the Greek Old Testament (where ‘Lord’ translated the name of God YHWH) and paralleled in Gentile worship where ‘lord’ was also a regular way of indicating deities (see 1 Corinthians 8:6). Paul see the Father and the Son as co-equal, and equally deserving of worship.