Question:
I intentionally started making kufr statements and started to belief in it and then said to my self this is kufr and rejected the statement which i was believing in and renounced it. Is my Islam valid?
Answer:
If you are demented then your Islam is still valid. However, if you are not demented then no, it is no longer valid since you intentionally negated it; and you must renew your shahada.
Hajj Gibril Haddad