You can get proficiency in every skill at 6th level.

[RogueJK]

Good catch. So we're back to Level 6, but you can still do it without the Ranger level as a Rogue 1/Knowledge Cleric 1/Lore Bard 4, and you'll end up with an extra +1 stat bump and an additional caster level too:

Race with 2 racial skills (2)
Background (2)
Skilled feat from background (3)
Rogue 1 (4)
Knowledge Cleric 1 (2)
Lore Bard 4 (1+3)
Skill Expert at Bard 4 (1)

Also doable without Bard as a Scout Rogue 4/Ranger 1/Knowledge Cleric 1, provided you take Rogue 4 after Cleric 1:

Race (2)
Background (2)
Skilled feat from background (3)
Scout Rogue 4 (4+2)
Eldritch Adept Beguiling Influence at Rogue 4 (2)
Ranger 1 (1)
Knowledge Cleric 1 (2)