How do I make my for each loop go through all my points?

I have a code that spawns "pixels" at every position between 0 and 10 in the x, y, and z direction with a step of 0.4. I am trying to change the transparency of certain "pixels" based on a text file. When I run this file, only the last "point" has the correct transparency. Here is my code:

 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
 using System.IO;
 using System;
 using System.Runtime.InteropServices;
 
 public class FileManager : MonoBehaviour
 {
     public Renderer rend;
     float[] lines;
     string filePath, fileName;
 
     void Update()
     {
         if (Input.GetMouseButton(0))
         {
             fileName = "Wave_Time_3.txt";
             filePath = Application.dataPath + "/" + fileName;
             ReadFromTheFile();
         }
     }
 
     public class Point
     {
         public float x { get; set; }
         public float y { get; set; }
         public float z { get; set; }
         public float p { get; set; }
     }
 
     public void ReadFromTheFile()
     {
         List<Point> Points = new List<Point>();
         List<string> lines = File.ReadAllLines(filePath).ToList();
         foreach(var line in lines)
         {
             string[] entries = line.Split(',');
 
             Point newPoint = new Point();
 
             newPoint.x = float.Parse(entries[0]);
             newPoint.y = float.Parse(entries[1]);
             newPoint.z = float.Parse(entries[2]);
             newPoint.p = float.Parse(entries[3]);
 
             Points.Add(newPoint);
         }
 
         Color color = this.GetComponent<MeshRenderer>().material.color;
         rend = GetComponent<Renderer>();
 
         foreach (var Point in Points)
         {
             if (transform.position == new Vector3(Point.x, Point.y, Point.z))
             {
                 rend.enabled = true;
                 color.a = Points[0].p;
                 this.GetComponent<MeshRenderer>().material.color = color;
             }
             else
             {
                 rend.enabled = false;
             }
         }
     }
 }

Here is the content of my text file:

 4.75 , 5.00 , 5.00 , 0.04361341
 5.00 , 4.75 , 5.00 , 0.04361341
 5.00 , 5.00 , 4.75 , 0.04361341
 5.00 , 5.00 , 5.00 , 0.99263654
 5.00 , 5.00 , 5.25 , 0.04361341
 5.00 , 5.25 , 5.00 , 0.04361341
 5.25 , 5.00 , 5.00 , 0.04361341