Can you still worship God after learning Buddhism and converting to Buddhism?

You can't. If you really converted to the Sambo, then you won't forget the oath you made in front of the Sambo statue at the conversion meeting. Let's watch it again:

Convert to Buddhism, to law, to monks.

I would rather give my life to convert to Buddhism, not to heretics and demons, and to enlightenment such as Tathagata and truth. This is my respect for compassion.

I would rather lay down my life than convert to heretical classics, and convert to all the three zang and twelve classics mentioned by the Tathagata. This is my respect for compassion.

I would rather give my life to convert to a monk than to a heretical person and to a clean Futian monk. This is my respect and compassion.

I have been a convert for nearly twenty years, but these vows are still vivid and I dare not forget a word.

For idols, Buddhist disciples can worship but can't bow down to convert, otherwise what is a Buddhist disciple? As a disciple of Buddha, except Buddha and Bodhisattva, you are the parents of your ancestors, and others should not bow down. However, in order to show respect, it is still possible to fold the inquiry.