Indestructible means "lethal damage and effects that say 'destroy' don't destroy this."
Your devotion to a color is the number of symbols of that color in the mana costs of permanents you control. Athreos (and the other Theros Gods) counts itself.
Finally, the card becomes a noncreature enchantment because... that's what the ability is supposed to do? I'm not sure what you're asking there.
You might benefit from reading the Magic Basic Rules and looking up the "evergreen" keywords.
To elaborate on the devotion part, a card like Goblin Chainwhirler has 3 red mana symbols in his mana cost. If he is the only creature you control, then your devotion to red equals 3. If you have him out along with a Goblin Trailblazer, because the Trailblazer has a cost of 1R, you would have a devotion to red of 4. So if your devotion to black and white is less than 7, in other words if there are fewer than 7 black or white mana symbols in the mana costs of permanents you control, Athreos isn’t a creature, so he can’t attack or block, but his abilities still trigger and can be activated. Keep in mind that your black and white mana symbols together need to total 7 or more to have him be a creature, not 7 black AND 7 white. He’s a fairly complex card, and I would encourage you to find someone in real life who can teach you the nuanced interactions his rules text creates.
There are certain cards in Magic that directly "destroy" or deal damage to a creature. Examples of this include Murder (for destroy) and Lightning Bolt (for direct damage). A creature dies (is moved to your graveyard) when various things happen. Two of those things include being destroyed (e.g. I cast Murder targeting your creature and it resolves) or your creature has been dealt lethal damage (e.g. I cast Lightning Bolt targeting your creature and your creature has a toughness equal to 3 or less). There are other ways your creature could be dealt lethal damage, like combat damage (I block your attacking creature and my blocker has power greater than or equal to your creature's toughness) or deathtouch damage (I block your attacking creature and my blocker has deathtouch and my blocker has power 1 or greater). There are even spells like Rabid Bite, where my creature can deal damage to your creature directly, and if my creature's power is bigger or equal to your creature's toughness, or has deathtouch, your creature will die.
You attack me with Grizzly Bears. I block it with Sedge Scorpion. After combat damage, Grizzly Bears has 1 damage marked on it and Sedge Scorpion has 2 damage marked on it. Since Grizzly Bears was damaged by a creature with deathtouch, it is destroyed and goes to the graveyard. Since Sedge Scorpion has only 1 toughness, it is destroyed and goes to the graveyard.
Athreos, God of Passage is not affected by any of the above affects. Lethal damage, deathtouch damage, or direct destroy effects do nothing to Athreos. He will still have the damage marked on him from damage source (so for example, two Lightning Bolts will still deal him 6 damage), but he will not go to the graveyard because the lethal damage does not destroy him.
Please note, though, there are other ways to get rid of him, as indestructible does not mean irremovable. A spell like Grasp of Darkness will lower his toughness to 0, and that will move him to the graveyard. Cards like Vraska's Contempt will still exile him.
What does devotion mean? My amount of lands in that colour? all spells in that colour?
Others have answered, so I will belabor this point. Suffice it to say, you look at all your permanents on the battlefield and count any W & B symbols you see in the upper right hand corner. If they equal 7 or more, Athreos is now a creature.
Why? Because Wizards chose to design the card that way. It was their way of showing that a God is only active when there are sufficient believers (in this case, sufficient devotion). When the devotion is there, Athreos is an enchantment creature (that is, both an enchantment and a creature). Otherwise, he is just an enchantment (and very specifically not a creature). This text overrides the Type Line where is says "Legendary Enchantment Creature - God." When your devotion is insufficient the "Creature" part of this Type Line does not apply, and it effectively only says "Legendary Enchantment - God."
What does Indestructible do?
What does devotion mean? My amount of lands in that colour? all spells in that colour?
Why is the "Athreos isn't a creature" there?
Thanks for help
Daniel
Your devotion to a color is the number of symbols of that color in the mana costs of permanents you control. Athreos (and the other Theros Gods) counts itself.
Finally, the card becomes a noncreature enchantment because... that's what the ability is supposed to do? I'm not sure what you're asking there.
You might benefit from reading the Magic Basic Rules and looking up the "evergreen" keywords.
I̟̥͍̠ͅn̩͉̣͍̬͚ͅ ̬̬͖t̯̹̞̺͖͓̯̤h̘͍̬e͙̯͈̖̼̮ ̭̬f̺̲̲̪i͙͉̟̩̰r̪̝͚͈̝̥͍̝̲s̼̻͇̘̳͔ͅt̲̺̳̗̜̪̙ ̳̺̥̻͚̗ͅm̜̜̟̰͈͓͎͇o̝̖̮̝͇m̯̻̞̼̫̗͓̤e̩̯̬̮̩n͎̱̪̲̹͖t͇̖s̰̮ͅ,̤̲͙̻̭̻̯̹̰ ̖t̫̙̺̯͖͚̯ͅh͙̯̦̳̗̰̟e͖̪͉̼̯ ̪͕g̞̣͔a̗̦t̬̬͓͙̫̖̭̻e̩̻̯ ̜̖̦̖̤̭͙̬t̞̹̥̪͎͉ͅo͕͚͍͇̲͇͓̺ ̭̬͙͈̣̻t͈͍͙͓̫̖͙̩h̪̬̖̙e̗͈ ̗̬̟̞̺̤͉̯ͅa̦̯͚̙̜̮f͉͙̲̣̞̼t̪̤̞̣͚e̲͉̳̥r͇̪̙͚͓l̥̞̞͎̹̯̹ͅi͓̬f̮̥̬̞͈ͅe͎ ̟̩̤̳̠̯̩̯o̮̘̲p̟͚̣̞͉͓e͍̩̣n͔̼͕͚̜e̬̱d̼̘͎̖̹͍̮̠,͖̺̭̱̮ ̣̲͖̬̪̭̥a̪͚n̟̲̝̤̤̞̗d̘̱̗͇̮͕̳͕͔ ͖̞͉͎t̹̙͎h̰̱͉̗e̪̞̱̝̹̩ͅ ̠̱̩̭̦p̯̙e͓o̳͚̰̯̺̱̰͔̘p̬͎̱̣̼̩͇l̗̟̖͚̠e̱͉͔̱̦̬̟̙ ̖͚̪͔̼̦w̺̖̤̱e͖̗̻̦͓̖̘̜r̭̥e͔̹̫̱͕̦̰͕ ̗͔̠p̠̗͍͍̱̳̠r̰͔͎̰o͉̥͓̰͚̥s̟͚̹̱͔̣t͉̙̳̖͖̪̮r̥̘̥͙̹a͉̟̫̟̳̠̟̭t͈̜̰͈͎e̞̣̭̲̬ ͚̗̯̟͙i͍͖̰̘̦͖͉ṇ̮̻̯̦̲̩͍ ̦̮͚̫̤t͉͖̫͕ͅͅh͙̮̻̘̣̮̼e͕̺ ͙l͕̠͎̰̥i̲͓͉̲g̫̳̟͈͇̖h̠̦̖t͓̯͎̗ ̳̪̘̟̙̩̦o̫̲f̙͔̰̙̠ ̹̪̗͇̯t͖̼̼͉͖̬h̹͇̩e͚̖̺̤͉̹͕̪ ͚͓̭̝̺G͎̗̯̩o̫̯̮̟̮̳̘d̜̲͙̠-̩̳̯̲̗̜P̹̘̥͉̝h͍͈̗̖̝ͅa͍̗̮̼̗r̜̖͇̙̺a̭̺͔̞̳͈o̪̣͓̯̬͙̯̰̗h̖̦͈̥̯͔.͇̣̙̝
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There are certain cards in Magic that directly "destroy" or deal damage to a creature. Examples of this include Murder (for destroy) and Lightning Bolt (for direct damage). A creature dies (is moved to your graveyard) when various things happen. Two of those things include being destroyed (e.g. I cast Murder targeting your creature and it resolves) or your creature has been dealt lethal damage (e.g. I cast Lightning Bolt targeting your creature and your creature has a toughness equal to 3 or less). There are other ways your creature could be dealt lethal damage, like combat damage (I block your attacking creature and my blocker has power greater than or equal to your creature's toughness) or deathtouch damage (I block your attacking creature and my blocker has deathtouch and my blocker has power 1 or greater). There are even spells like Rabid Bite, where my creature can deal damage to your creature directly, and if my creature's power is bigger or equal to your creature's toughness, or has deathtouch, your creature will die.
Here are some examples:
Please note, though, there are other ways to get rid of him, as indestructible does not mean irremovable. A spell like Grasp of Darkness will lower his toughness to 0, and that will move him to the graveyard. Cards like Vraska's Contempt will still exile him.
Others have answered, so I will belabor this point. Suffice it to say, you look at all your permanents on the battlefield and count any W & B symbols you see in the upper right hand corner. If they equal 7 or more, Athreos is now a creature.
Why? Because Wizards chose to design the card that way. It was their way of showing that a God is only active when there are sufficient believers (in this case, sufficient devotion). When the devotion is there, Athreos is an enchantment creature (that is, both an enchantment and a creature). Otherwise, he is just an enchantment (and very specifically not a creature). This text overrides the Type Line where is says "Legendary Enchantment Creature - God." When your devotion is insufficient the "Creature" part of this Type Line does not apply, and it effectively only says "Legendary Enchantment - God."
https://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules
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http://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules