How do I remove tile from my bathroom walls and countertop?

If you chisel out one of the squares you should be able to get under the edge of the adjacent tiles with a flat edge scraper and start pushing them off. If this doesn't work them you have to break them up with a hammer.

Since you have an old house, it looks like the best thing to do would be to gut the bathroom. You'll be able to check everything behind the walls, ceiling and floor (electric, plumbing, drywall, cement board, heat and air ducts, exhaust fan and insulation). Then you can repair or replace anything with water rot or mold. I noticed there were lose tiles, so it's possible some repairs may be necessary.

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Oscillating tool with a scraper blade or other attachment under or behind the tiles after breaking one with a chisel to start.

Start chipping away. I removed a tiled counter top and back splash with a putty knife and a crow bar. It took a while and also took some of the sheetrock off. I learned my lesson, no tile in my house, never again.

If the tiles are solid you can put new tile right on top of it. Or get some of that bathroom epoxy paint and paint them.

We've done this many time. No matter how careful you are be prepared for some damage to the walls. Most likely you will need to add new cement board to the walls.

Very carefully. Wall tiles will take out the drywall or plaster. You might need more plywood when you take off the title on the counter top. How about a new sink and cabinet . Not very expensive get a builder grade. Good luck. tap tap tap lol