Since as God, the Divine Logos, He transcends time, He can properly be spoken of in just about any tense, but when talking about His characteristics (liberal, merciful, just, loving) then the present tense is most proper, in that He exists beyond existence, and is those things (in as much as any human words can fully describe Him).
If you are talking of the time that the Uncircumscribable became incarnate, was Circumscribed within the Womb More Spacious Than The Heavens, was born according to the flesh, and dwelt physically among men, then the past tense is appropriate.