Read data from XML

public class Religion : MBObjectBase
{
    public TextObject Name { get; set; }
    public TextObject Description { get; private set; }
    public float Fervor { get; private set; }
    public List<CultureObject> Cultures { get; private set; } = new List<CultureObject>();
    public List<string> InitialHeroes { get; private set; } = new List<string>();

    public override void Deserialize(MBObjectManager objectManager, XmlNode node)
    {
        base.Deserialize(objectManager, node);

        this.Name = new TextObject(node.Attributes.GetNamedItem("Name").Value, null);

        float fervor = 0;
        if (float.TryParse(node.Attributes.GetNamedItem("Fervor").Value, out fervor)) this.Fervor = fervor;

        // read long descriptiont from the separate ee_strings.xml file
        this.Description = GameTexts.FindText("ee_religion_description", base.StringId);

        if (node.HasChildNodes)
        {
            foreach (object obj in node.ChildNodes)
            {
                XmlNode xmlNode = (XmlNode)obj;
                if (xmlNode.Name == "Cultures")
                {
                    foreach (object obj2 in xmlNode.ChildNodes)
                    {
                        XmlNode xmlNode2 = (XmlNode)obj2;
                        if (xmlNode2.Name == "Culture")
                        {
                            CultureObject cultureObject = MBObjectManager.Instance.ReadObjectReferenceFromXml<CultureObject>("id", xmlNode2);
                            if (cultureObject != null)
                            {
                                this.Cultures.Add(cultureObject);
                            }
                        }
                    }
                }

                if (xmlNode.Name == "Heroes")
                {
                    foreach (object obj3 in xmlNode.ChildNodes)
                    {
                        XmlNode xmlNode3 = (XmlNode)obj3;
                        if (xmlNode3.Name == "Hero")
                        {
                            string value = xmlNode3.Attributes.GetNamedItem("id").Value;
                            if (!string.IsNullOrWhiteSpace(value) && !this.InitialHeroes.Contains(value))
                            {
                                this.InitialHeroes.Add(value);
                            }
                        }
                    }
                }
            }
        }
    }
}

Data XML file

<?xml version="1.0" encoding="utf-8" ?>
<Religions>
    <Religion id="baltic_paganism" Name="Baltic Paganism" Fervor="40">
        <Cultures>
            <Culture id="Culture.baltic" />
            <Culture id="Culture.latvian" />
            <Culture id="Culture.estonian" />
        </Cultures>
        <Heroes></Heroes>
    </Religion>

    <Religion id="catholicism" Name="Catholicism" Fervor="70">
        <Cultures>
            <Culture id="Culture.crusader" />
        </Cultures>
        <Heroes>
            <Hero id="lord_lit_1_2" />
        </Heroes>
    </Religion>

    <Religion id="orthodoxy" Name="Orthodoxy" Fervor="60">
        <Cultures>
            <Culture id="Culture.rus" />
        </Cultures>
        <Heroes>
            <Hero id="lord_lit_1_5" />
        </Heroes>
    </Religion>
</Religions>

Strings XML file

<?xml version="1.0" encoding="utf-8"?>
<strings>
    <string id="ee_religion_description.baltic_paganism" text= "{=!ee_religion_description.baltic_paganism}Baltic Paganism is the pre-Christian religion ..."/>
    <string id="ee_religion_description.catholicism" text= "{=!ee_religion_description.catholicism}Catholicism is a major branch of Christianity that ..." />
    <string id="ee_religion_description.orthodoxy" text= "{=!ee_religion_description.orthodoxy}Orthodoxy is a branch of Christianity that ..." />
</strings>

Include those files in Submodule.xml

<XmlNode>
    <XmlName id="Religions" path="ee_religions" />
    <IncludedGameTypes>
        <GameType value="Campaign" />
        <GameType value="CampaignStoryMode" />
        <GameType value = "CustomGame"/>
        <GameType value = "EditorGame"/>
    </IncludedGameTypes>
</XmlNode>

<XmlNode>
    <XmlName id="GameText" path="ee_strings"/>
    <IncludedGameTypes>
        <GameType value = "Campaign"/>
        <GameType value = "CampaignStoryMode"/>
        <GameType value = "CustomGame"/>
        <GameType value = "EditorGame"/>
    </IncludedGameTypes>
</XmlNode>

Load data from XML in SubModule.cs:

public override void BeginGameStart(Game game)
{
    if (game.GameType is Campaign)
    {
        game.ObjectManager.RegisterType<Religion>("Religion", "Religions", 100U, true, false);
        MBObjectManager.Instance.LoadXML("Religions", false);
    }
}