Can I become Muslim if I still have doubts?

Yes, if you believe the core. You need to believe there is one God and that Muhammad ﷺ is His Messenger. You don't need answers to every question first. Many Muslims, including converts, keep learning and working through questions for years. Faith often grows after the shahada, not just before it.

Belief vs. unanswered questions

There's a difference between:

Doubting the core: "I'm not sure God exists" or "I don't think Muhammad was a prophet." Keep learning before taking the shahada.
Questions about details: "I don't understand this ruling yet" or "Why does Islam say this?" These don't stop you from becoming Muslim.

Every Muslim, even scholars, has topics they're still learning about. If you believe in one God and accept Muhammad ﷺ as His Messenger, the remaining questions are part of a lifelong journey, not a locked gate. See Can I still be Muslim if I struggle with same-sex attraction?

Faith can grow over time

قَالَتِ ٱلْأَعْرَابُ ءَامَنَّا ۖ قُل لَّمْ تُؤْمِنُوا۟ وَلَـٰكِن قُولُوٓا۟ أَسْلَمْنَا وَلَمَّا يَدْخُلِ ٱلْإِيمَـٰنُ فِى قُلُوبِكُمْ "The bedouins say, 'We have believed.' Say, 'You have not [yet] believed; but say [instead], "We have submitted," for faith has not yet entered your hearts.'" Quran 49:14

This verse shows people entering Islam whose faith was still growing. Allah accepted their submission and invited them to deepen it. See What if I become Muslim and change my mind?

Even prophets asked questions

Prophet Abraham asked Allah to show him how He gives life to the dead, "to be stronger in Faith." The Prophet Muhammad ﷺ said: "We have more right to be in doubt than Abraham" (Sahih al-Bukhari 4537), meaning that seeking reassurance isn't disbelief.

Practical steps

Write down your questions and ask a knowledgeable imam or convert, not random comment sections.
Read the Quran with a good translation and commentary.
Make dua: ask Allah sincerely to guide you to the truth.
Separate culture from Islam: some "doubts" are about how Muslims behave, not what Islam teaches.

After the shahada

Doubts can come back later, and that's normal too. What matters is how you deal with them. See What if I have doubts about Islam after becoming Muslim? and Is it okay to wait before taking my shahada?

Key points

You need to believe the core of the shahada.
Questions about details don't stop you.
Faith grows over time.
Ask trusted, knowledgeable people.

Tip: Bring your top three questions to a convert meet-up. Hearing how others worked through the same questions is often more helpful than any book.