Locate the Sniper: Use a recon drone or UAV to locate the sniper on the mountain side opposite the church.
Move Forward: Once you've located the sniper, move your team towards the church on the left side. This is the best route to take, as it provides ample cover and minimizes your exposure to the sniper.
Use Frag Grenades: Equip all of your operators with frag grenades. Cooking and then throwing a grenade at the sniper's position can take him out effectively.
Suppress the Sniper: Use an operator with a rifle equipped with a suppressor to keep the sniper under fire and prevent him from taking shots at your team. This will give your team members a chance to move forward.
Coordinate Your Team: Communicate with your teammates to coordinate a push on the sniper's position. Have one or two operators provide covering fire while the rest move forward to take him out.
Use Tactical Equipment: Use tactical equipment like smoke grenades to provide cover for your team as they move forward and to obscure the view of the sniper.
Be Patient: Don't rush the sniper's position. Take your time and use grenades and suppressing fire effectively to clear out the enemies.