I think we and the Jews worship the same God and that he loves us equally.
This is true, that there is no partiality with God, but the breastplate of righteousness is what gives us boldness to approach the throne of grace, and there is a type teaching that Christians tend to promote a bit carelessly. That can lead to the impression that "no one is righteous, so therefore why even bother trying? - eat, drink, be merry for tomorrow we will die. God is good, He loves us so much He even sent His son to die to pay the price for our sin - past, present and future".
It is easy to get that impression from Christians who have already taken aboard to believe such things, and this is what the author of that article is primarily objecting to - although there are Christian scriptures that condemn that attitude too! (eg: Hebrews 10:26-31).
Righteousness is by definition "being morally justifiable" - meaning that repentance (obedient to what God is teaching us - Romans 12:2, John 15) is the key to righteousness and therefore the underlying factor of our confidence toward judgement (Romans 8:33, Isaiah 54:17).
That means that as long as we remain of good conscience (1 Peter 3:21), we have no doubt as to our moral justification, having perfect confidence toward salvation.
The author of that article makes valid points to this effect, however it is clear that he has taken a view of Christianity that does not reflect the authentic knowledge of Christianity, and it is probably true that this has been inspired in him by so-called Christians that themselves do not understand the key principle of it:
Christianity is in fact Judaism implemented under Jesus as everlasting High Priest (consider Matthew 21:43 and Hebrews 7:23-25, also Acts of the Apostles 15:19, esp. Acts of the Apostles 15:10).