I tried to morph a creature in to a creature that were standing next to serene templar and I wasnt allowed. If this isnt a bug text on morph should be changed.

Well, not all spells and enchantments mention "target" word. I can change Morph's description, but what to do with all other cards?

I think it is obvious enough that to choose/select creature you need to target it.

I don't think it's obvious at all. It's not necessary for the creature being copied to be hit by any kind of magical energy for the spell to make sense. Think of an artist painting a portrait of someone. He/she needs to see the model while painting to make the painting accurate.

Revenant Bishop works, thats why I thought Morph would work too.

Bishop is neither Spell nor Enchantment, that's why Serene Templar doesn't prevent it from targeting.