Believe me, if you ask Tenshi is in the game (due to both the game's title kanji (just remove the kanji meaning "woman / girl" and you will know the answer) and the protagonist being a being of Heaven like Tenshi), then I would say "no".

They don't even belong to the same Heaven.

But still, the concept of Heaven in many religions are very similar, right?

HAHAHAHAHAHAHAHAHAHA~

Whether it is the Christian Heaven, Buddhist Heaven or Shinto Heaven, then Tenshi's relatives are everywhere.

That's why her theme even show up in the peaceful and eternal Christian Heaven.

(Don't ask me who is the relative of Tenshi who resides in the Christian Heaven, it is all in the game. Wait until it receive a full release and play it, and you will know the answer)

H̴̡̹̤̖̳̖̪͖͖̜̮͓̠̟͇̩̱̖̖̙̳̘̯̣̞̏̏͆͑̔́͆̌͛̏̒̔ͅÏ̷̢̻̲͓͇̝͙̟͓͉̣̝̞͕̺̩͙̭͇̣̒̅̂̈́͝Ņ̴̨̨͓͇͎͇̠̮̬̟̬͖͚͕̯͈͚̱̽̊̆ͅͅT̸̨̙͇̳̪̗̼͔̱̣̘͕̗͓͎̺͙̞̘̄͜ͅ:̸̧͚̰̙̫̝̱̪̘̟̘̣̳̺͈̙̞̮̈́̾̑̿̈́͂̓̾̂̽̏́̚̚͘͝ ̴̩͎̱̦͔̦̮̝̾̌̈́͂̌̐̊͋̏̍Ẅ̶͓̮̰̼̟̯̙̫͍͓́͂̄͘ę̵̦̰̪͉̻̘̮̈́̂̀̃͘͜ĕ̷̡̨̢̧̺̟̞̩͓̠̖̰̞̰͇̗̝͂̓k̸̨̺̟͕̳̲̮̣̎ ̵̨̡̤͖͎̮̘̞̞̣͙͙̯̦̞̣̜̪̪̩̱͛̋͒͊̒̒̊̐̽͛͒̇̄͌̾̈́̇̓͌͒̽͘͘ͅ4̷͍̝̋́̍̒̋͝ ̶̢̫͖͇̫͇̝͍͐̐̉̂̅̐̀̆͝ͅo̷̙̖̤̖̼͎̠̖͆̿͂̌͌̆͌̒̎̆̄̓̚̚̚͝f̷̨̭͉̻͙̠̮̩̯͚̞̭̦͙̹̙͙̱̜̐͂́͗͗̀͐̌̈́̚͜͜͠ ̴͙̲̺̲̦̝̜̼̱͚̞̫̹͈̩̼̠͈͇̭͒̋͗̎͒̎̈̇͆̂͗͗̂̃̿̔̕͝ͅͅṱ̵̡̨̛̹̥̳͙̹͕͚̳̩̙̹̘͚̖̳̩̬͕̩͔̙̠̏̓̀̐̑̚͠ͅḩ̷̧̗̟̖͇͔́̏̀̄̅͒̑͒̄̍̓͌̊̕̚͝ę̷̧̨̪̜̖̼̮̭͙̖͓̠͎̭̜̬͍̈́̇͝͝ ̶̢̦͚̲̟͚̦̮̞̱͉̭͖͖̙̪͕̱͔̣̰̦͉̾̒̀͗̒̄̿͜ͅg̷̠̝̙̺̳̮͚͇̻̘̀̽͋͑̋̏̐à̴̧͙̠̲̙̞̱͙͉̪̗̝̫̪͖͈̬̫̐̃͂̀̈́̂̕m̶̧̨̡̱̙̦̱̯͎̬͍͕̘̘̞̻̖̭̝̰̥̈́̃̈͊̀͂͊̇̽̽̾̈́̿̃̇̇͗̃̈́̕̕͜͝ͅȩ̷̢̢̺̤͇͍͓̝̯̰͇͔̻͓̟̦͕̥͔̜̈́̈́̉̄̀̓̆̈͜͜͠ͅ ̶̛̠͖̱̭̳̈̓̽͐͒̒͊̕͜͠͝c̴̡̢̯̯̺̼̭̯̗͉̬͕͓͉͙̣̠̟̼̝͎̀́̏̔̎̅̒̉̚̚̚͜ͅo̴̹̜̤̰̤̱̣̣̟̻̦̙͕̜͛̎̊̎͗́̾́͗̌̍̔̾͋̑̄͘͜͜͝͠ṇ̷̨̧̠̫̣̯̺̎̀͐͆̊ṱ̷̥͓̘̠̬̻͆͊̽̄̍̊̓͛̈́̏̚͝͠ͅa̷͔͉͓̱͎̳̯̣̮͍̰͎͂̒͊̍̎̅̃͛̃̀́͘ͅį̴̨͚̳͓̘͈̤̹̺̰͔͒͑̈́̽̏̍̉͌͒̊ń̸̨̡̧̛̬͉̙͓̘͖̲͋̄̒̊̄̈̂̿̆͒͌͒̿͊͜ş̷̝̩͍͎͎̘̞̅̌̀̅͌̈́̈͗̍̓̈́̏͒͆̓͛̌̈́̾̋͌̏͘̕͝͠ ̸̧͈̥̟̣̱̦̫̭̳̙͉̟̝́̑͛͋̄́̂̓̾̾̏̆̏̂̌́̈̚̕͝t̴̢̛͚͚͓̲̹̜̯̥͖͕̲͗͗͛͒̈́̆̆͋̋̃̂̍̔̎͗̾̈̆̑͑͒̕͘͘͜͝h̵̢̧̹̱̤̞̘̤̞͍̗̳̖̦͉͌̾̌̿e̷̡̢̡̱̭̼͖͎̪̟͖͙̱͌̓́͐͒̈̈́͂̓̉́̓̀̋̿̋̐͌͗̄̍̒̕͝͠ ̸̛̘͈͛̌̒́͋͋͗̔̂̾͛̾̽͑̍̌̀̎̐̅̿̕͠ä̸̢̧͎͎̱̳̼̜̼̘̟̹̣̳́̎̎͋͐̔̏̾͗̈̾̆̓̒̈͆͌̿̽͒̊̑͝͠ṉ̵̅͋̒̋͗͛̔͂̊̍̓̈́̑́̓̓͋̌͝s̴̠̯̙̱̟̖͚̳̬̘͊͊͗̏̽̎̂͌̌̎̉͑̈́̒̏̄͒͠w̵̧̨̬̤̖͈͇̜͕̣͎̬̺̘̜͇̮̜͈̥̱̜̖̜̅̑͆́͂́̈́̉́̓͂̎̈́̔̋̌̅͘̕͝͠ͅę̶̧̡̡̧͖̳̳̩͉̯͉͕̠̭̩̟̝̪̣͇͎̗͕̓̍́͗̽͜͝͝ŗ̸̢̘̤̱̱̯̻̘̝̮̊̇̿̒͛̊͜͜ͅ