That all property, both real and personal, belonging to or held in trust for any Baptist church or any Baptist religious society that has or shall become extinct, shall vest in and become the property of the Kansas Baptist Convention and its successors and assigns: Provided, That nothing herein contained shall affect the title to any Baptist church or Baptist religious society property that is held by any of the Baptist associations of the state: And provided further, That this act shall not affect the reversionary interest of any person or persons in such property or any valid lien thereon.